Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | 1968 CF\ndesignator | Place of\nmanufacture | Primary\nrole(s) | Service\nperiod | #\nused |
| --- | --- | --- | --- | --- | --- |
| AgustaWestland CH-149 Cormorant | CH-149 | UK/Italy | Search and Rescue helicopter | 2000–current | 15 |
| Airbus Polaris | CC-150 | France | transport/tanker | 1992–current | 5 |
| Airco DH.4 | n/a | UK | bomber | 1920–1928 | 12 |
| Airco DH.9A | n/a | UK | bomber | 1920–1929 | 12 |
| Airspeed Horsa | n/a | UK | glider troop transport | 1948–1950 | 3 |
| Airspeed Oxford | n/a | UK | trainer (navigation, bombing & radio) | 1939–1947 | 819 |
| Armstrong Whitworth Atlas | n/a | UK | army co-operation | 1927–1942 | 16 |
| Armstrong Whitworth Siskin | n/a | UK | fighter | 1926–1940 | 12 |
| Auster AOP6 & T7 | n/a | UK | air observation post | 1948–1958 | 42 |
| Avro 504 | n/a | UK | trainer | 1920–1934 | 97 |
| Avro 552 Viper | n/a | Canada | forestry patrol | 1924–1928 | 14 |
| Avro Avian Mk.IVM | n/a | UK | utility/trainer | 1929–1936 | 29 |
| Avro Tutor (Avro 621) | n/a | UK | trainer | 1931–1945 | 7 |
| Avro Prefect (Avro 626) | n/a | UK | trainer | 1937–1945 | 12 |
| Avro Anson | n/a | UK/Canada | medium bomber/trainer | 1940–1947 | 4413 |
| Avro Lancaster | n/a | UK/Canada | heavy bomber | 1944–1965 | 229 |
| Avro Lincoln | n/a | UK/Canada | heavy bomber | 1946–1947 | 3 |
| Avro Wright | n/a | Canada | forestry patrol | 1925–1930 | 1 |
| Avro Canada CF-105 Arrow | CF-105 | Canada | interceptor | 1958–1959 | 5 |
| Avro Canada CF-100 Canuck | CF-100 | Canada | interceptor | 1951–1984 | 692 |
| BAE Systems/Advanced Ceramics Research Silver Fox | CU-167 | UK | UAV | ?–? | 4+ |
| BAE Systems Hawk | CT-155 | UK | advanced trainer | 2000–current | 22 |
| Barkley-Grow T8P-1 | n/a | US | transport | 1939–1941 | 1 |
| Beechcraft Expeditor | CT-128 | US | utility/trainer | 1941–1972 | 394 |
| Beechcraft Harvard II | CT-156 | US | elementary trainer | 2000–current | 26 |
| Beechcraft King Air | CT-145 | US | transport/trainer | 1992–current | 8 |
| Beechcraft Mentor | n/a | US | elementary trainer | 1954–1956 | 25 |
| Beechcraft Musketeer | CT-134 | US | elementary trainer | 1971–1992 | 46 |
| Bell 47D & G | n/a | US | utility helicopter | 1948–1965 | 9 |
| Bell Griffon | CH-146 | Canada | utility helicopter | 1994–current | 100 |
| Bell Iroquois | CH-118 | US/Canada | utility helicopter | 1968–current | 10 |
| Bell Jet Ranger | CH-139 | US | utility helicopter | 1981–1993 | 14 |
| Bell Kiowa | CH-136 | US | utility helicopter | 1971–1997 | 74 |
| Bell Twin Huey | CH-135 | US | utility helicopter | 1971–1999 | 50 |
| Bellanca CH-300 Pacemaker | n/a | US | transport | 1929–1944 | 13 |
| Blackburn Shark Mk.II & III | n/a | UK | torpedo bomber | 1936–1944 | 26 |
| Boeing 247D | n/a | US | transport | 1940–1942 | 8 |
| Boeing CC-137 | CC-137 | US | transport/tanker | 1970–1997 | 5 |
| Boeing Fortress Mk.II | n/a | US | long-range patrol bomber | 1943–1946 | 6 |
| Boeing Globemaster III | CC-177 | US | transport | 2007–current | 4 |
| Boeing Insitu ScanEagle | CU-169 | US | UAV | 2008–current | ? |
| Boeing Stratojet | n/a | US | bomber used as engine testbed | 1956–1959 | 1 |
| Boeing-Vertol Chinook | CH-147 | US | transport helicopter | 1974–1992 | 9 |
| Boeing-Vertol Labrador & Voyageur | CH-113 | US | Search and Rescue helicopter | 1963–2004 | 18 |
| Brewster Bermuda | n/a | US | dive bomber | 1943–1946 | 3 |
| Bristol Beaufort | n/a | UK | torpedo bomber/strike/minelayer | 1941–1944 | 15 |
| Bristol Blenheim Mk.IV | n/a | UK | medium bomber/gunnery trainer | 1941–1945 | 1 |
| Bristol F.2B Fighter | n/a | UK | fighter | 1920–1922 | 2 |
| Bristol Fairchild Bolingbroke | n/a | Canada | bomber/trainer | 1939–1947 | 626 |
| Bristol Freighter | n/a | UK | cargo | 1952–1967 | 6 |
| Burgess-Dunne | n/a | US | reconnaissance | 1914–1914 | 1 |
| Canadair Argus | CP-107 | Canada | maritime patrol | 1957–1988 | 33 |
| Canadair C-5 North Star | n/a | Canada | VIP transport | 1950–1967 | 1 |
| Canadair CF-5 Freedom Fighter | CF-116 | Canada | fighter/ground attack | 1968–current | 133 |
| Canadair Challenger | CC-144 | Canada | VIP transport/EW trainer/maritime patrol | 1983–current | 18 |
| Canadair Cosmopolitan | CC-109 | Canada | transport | 1960–1994 | 13 |
| Canadair Dynavert | CX-131 | Canada | experimental VTOL tilt-wing | 1969–1975 | 3 |
| Canadair North Star | n/a | Canada | transport | 1947–1966 | 24 |
| Canadair Sabre | n/a | Canada | fighter | 1950–1977 | 1184 |
| Canadair Silver Star | CT-133 | Canada | trainer/EW | 1953–current | 656 |
| Canadair Starfighter | CF-104 | Canada | fighter | 1961–1988 | 200 |
| Canadair Tutor | CT-114 | Canada | trainer | 1963–2000 | 190 |
| Canadair Yukon | CC-106 | Canada | transport | 1959–1971 | 12 |
| Canadian Vickers Vancouver | n/a | Canada | patrol flying boat | 1929–1940 | 6 |
| Canadian Vickers Vanessa | n/a | Canada | utility/transport | 1927–1927 | 1 |
| Canadian Vickers Varuna | n/a | Canada | patrol flying boat | 1926–1930 | 8 |
| Canadian Vickers Vedette | n/a | Canada | patrol flying boat | 1925–1941 | 44 |
| Canadian Vickers Velos | n/a | Canada | patrol floatplane | 1927–1928 | 1 |
| Canadian Vickers Vigil | n/a | Canada | training/utility | 1928–1930 | 1 |
| Canadian Vickers Vista | n/a | Canada | patrol flying boat | 1927–1931 | 1 |
| Cessna 182/L-182 | CO-119 | US | utility | 1961–1973 | 10 |
| Cessna Bird Dog/L-19 | CO-119 | US | utility/liaison | 1954–1983 | 25 |
| Cessna Crane | n/a | US | trainer | 1941–1949 | 826 |
| Consolidated Catalina/Canso | n/a | US/Canada | maritime patrol seaplane | 1941–1962 | 254 |
| Consolidated Courier | n/a | US | utility | 1928–1941 | 3 |
| Consolidated Liberator | n/a | US | maritime patrol | 1943–1948 | 148 |
| Consolidated Privateer | n/a | US | maritime patrol | 1946–1949 | 1 |
| Curtiss Canuck | n/a | Canada | trainer | 1920–1923 | 10 |
| Curtiss H-16 | n/a | US | patrol flying boat | 1922–1924 | 2 |
| Curtiss HS-2L | n/a | US | patrol flying boat | 1920–1928 | 30 |
| Curtiss Kittyhawk | n/a | US | fighter | 1941–1946 | 134 |
| Curtiss Seamew | n/a | US | utility floatplane | 1943–1944 | 82 |
| Curtiss Tomahawk | n/a | US | fighter | 1943–1946 | 4 |
| Curtiss Warhawk | n/a | US | fighter | 1942–1943 | 9 |
| Curtiss-Reid Rambler | n/a | Canada | trainer/utility | 1929–1954 | 9 |
| Dassault Falcon | CC-117 | France | VIP transport | 1967–1989 | 8 |
| de Havilland Comet | n/a | UK | transport | 1953–1965 | 2 |
| de Havilland Dragonfly | n/a | UK | transport | 1940–1945 | 6 |
| de Havilland Fox Moth | n/a | Canada | transport | 1941–1945 | 1 |
| de Havilland Genet Moth | n/a | UK | role | 1928–1932 | 2 |
| de Havilland Hawk Moth | n/a | UK | transport | 1929–1935 | 3 |
| de Havilland Menasco Moth | n/a | Canada | trainer | 1941–1947 | 136 |
| de Havilland Mosquito | n/a | UK/Canada | bomber/fighter-bomber | 1943–1951 | 444 |
| De Havilland Moth | n/a | UK | trainer | 1928–1948 | 89 |
| de Havilland Puss Moth | n/a | UK | transport | 1931–1944 | 19 |
| de Havilland Sea Hornet | n/a | UK | fighter | 1948–1948 | 1 |
| de Havilland DH.82C Tiger Moth | n/a | Canada | trainer | 1938–1948 | 1410 |
| de Havilland Vampire | n/a | UK | fighter | 1946–1958 | 86 |
| de Havilland Canada Buffalo | CC-115 | Canada | transport | 1967–current | 15 |
| de Havilland Canada Caribou | CC-108 | Canada | transport | 1960–1971 | 9 |
| de Havilland Canada Chipmunk | CT-120 | Canada | elementary trainer | 1948–1972 | 100 |
| de Havilland Canada Dash 7 | CC-132 | Canada | transport | 1979–1987 | 2 |
| De Havilland Canada Dash-8 | CT-142 | Canada | transport/trainer | 1989–current | 6 |
| de Havilland Canada Otter | CSR-123 | Canada | transport | 1953–1984 | 69 |
| de Havilland Canada Twin Otter | CC-138 | Canada | transport | 1971–current | 9 |
| Douglas Boston | n/a | US | bomber | 1941–1945 | 3 |
| Douglas Dakota | CC-129 | US | transport | 1943–1990 | 169 |
| Douglas Digby | n/a | US | bomber | 1939–1946 | 20 |
| Douglas MO-2B | n/a | US | utility/patrol | 1927–1930 | 1 |
| EADS Eagle 1 | CU-160 | Netherlands | UAV | 2003–2003 | 1 |
| ELBIT Skylark | CU-168 | Israel | UAV | 2006–current | 5 |
| Fairchild 51 & 51A | n/a | US/Canada | transport | 1930–1946 | 9 |
| Fairchild 71, 71B & 71C | n/a | US/Canada | transport | 1929–1942 | 23 |
| Fairchild Argus | n/a | US | utility | 1940–1945 | 2 |
| Fairchild Cornell | n/a | US | elementary trainer | 1942–1948 | 1555 |
| Fairchild FC-2, 2L & 2W | n/a | US/Canada | transport | 1927–1938 | 27 |
| Fairchild KR-34 | n/a | US | utility | 1930–1936 | 1 |
| Fairchild Super 71 | n/a | Canada | transport | 1936–1940 | 2 |
| Fairchild Flying Boxcar | n/a | US | transport | 1952–1967 | 35 |
| Fairey IIIC & IIIF | n/a | UK | bomber | 1920–1930 | 2 |
| Fairey Albacore | n/a | UK | torpedo bomber | 1943–1949 | 6 |
| Fairey Battle | n/a | UK | bomber/trainer/target tug | 1939–1946 | 740 |
| Fairey Swordfish Mk.II & III | n/a | UK | torpedo bomber | 1943–1947 | 105 |
| Felixstowe F.3 | n/a | UK | patrol flying boat | 1921–1923 | 11 |
| Fleet Fawn | n/a | Canada | elementary trainer | 1931–1947 | 51 |
| Fleet Finch | n/a | Canada | elementary trainer | 1939–1947 | 431 |
| Fleet Fort | n/a | Canada | intermediate/radio trainer | 1941–1945 | 101 |
| Fleet Freighter | n/a | Canada | transport | 1942–1944 | 2 |
| Fokker Super Universal | n/a | US | transport | 1929–1929 | 1 |
| Ford 6-AT Trimotor | n/a | US | transport | 1929–1937 | 1 |
| General Aircraft Hotspur Mk.II | n/a | UK | training glider | 1942–1945 | 22 |
| General Atomics Altair | CU-163 | US | UAV | 2004–2004 | 1? |
| Gloster Meteor | n/a | UK | fighter | 1945–1955 | 4 |
| Grumman Albatross | CSR-110 | US | Search and Rescue amphibian | 1960–1971 | 10 |
| Grumman Goblin | n/a | US/Canada | fighter | 1940–1942 | 15 |
| Grumman Goose | n/a | US | utility amphibian | 1938–1956 | 31 |
| Grumman Tracker | CP-121 | Canada | carrier-borne ASW | 1968–1994 | 72 |
| Handley Page Hampden | n/a | UK | bomber | 1941–1944 | 96 |
| Handley Page Harrow | n/a | UK | bomber/transport | 1940–1941 | 2 |
| Handley Page Halifax | n/a | UK | heavy bomber | 1944–1947 | 5 |
| Hawker Audax | n/a | UK | army cooperation | 1933–1943 | 6 |
| Hawker Hart | n/a | UK | bomber | 1937–1943 | 3 |
| Hawker Hind | n/a | UK | instructional airframe | 1942–1943 | 4 |
| Hawker Hurricane | n/a | UK/Canada | fighter | 1939–1948 | 502 |
| Hawker Sea Hurricane | n/a | UK | fighter | 1942–1943 | 1 |
| Hawker Tempest Mk.VI | n/a | UK | fighter | 1946–1947 | 1 |
| Hawker Tomtit | n/a | UK | trainer | 1930–1943 | 2 |
| Hiller Nomad | CH-112 | US | utility helicopter | 1961–1973 | 27 |
| IAI Heron | CU-170 | Israel | UAV | 2008–current | 2+ |
| Keystone Puffer | n/a | US | crop duster/utility | 1927–1934 | 2 |
| Lockheed Arcturus | CP-140A | US | training/reconnaissance | 1992–current | 3 |
| Lockheed Aurora | CP-140 | US | maritime patrol | 1980–current | 18 |
| Lockheed Electra | n/a | US | transport | 1939–1946 | 15 |
| Lockheed Electra Junior | n/a | US | transport | 1940–1945 | 10 |
| Lockheed Hercules | CC-130 | US | transport | 1960–current | 61 |
| Lockheed Hudson | n/a | US | bomber | 1939–1948 | 247 |
| Lockheed Lodestar | n/a | US | transport | 1943–1948 | 18 |
| Lockheed Model 212 | n/a | US | transport | 1940–1946 | 1 |
| Lockheed Neptune | CP-122 | US | maritime patrol | 1955–1970 | 25 |
| Lockheed Shooting Star/Silver Star | n/a | US | trainer | 1951–1955 | 31 |
| Lockheed Starfighter | CF-104 | US | fighter | 1962–1986 | 39 |
| Lockheed Starlifter | CC-141 | US | transport | cancelled | 0 |
| Lockheed Ventura | n/a | US | maritime patrol/target tug | 1942–1947 | 286 |
| Martin Baltimore | n/a | US | bomber | 1942–1942 | 1 |
| Martinsyde F6 | n/a | UK | fighter | 1922–1925 | 1 |
| MBB/Kawasaki BK 117 | CH-143 | Germany/Japan | utility helicopter | 1989–1990 | 1 |
| McDonnell Douglas CF-18 Hornet | CF-188 | US | fighter | 1982–current | 138 |
| McDonnell Voodoo | CF-101 | US | interceptor | 1963–1990 | 66 |
| Meggitt Vindicator II | CU-162 | UK | UAV | ?–? | ? |
| Mil Mi-17 | CH-178 | Russia | transport helicopter | 2010–current | 4 |
| Noorduyn Norseman | n/a | Canada | utility transport | 1940–1957 | 100 |
| North American AT-6D Texan | n/a | US | advanced trainer | 1951–1954 | 100 |
| North American Harvard | n/a | US/Canada | advanced trainer | 1939–1968 | 2156 |
| North American Mitchell | n/a | US | bomber | 1942–1963 | 164 |
| North American Mustang Mk.IV | n/a | US | fighter | 1947–1961 | 130 |
| North American NA-26 | n/a | US | trainer | 1940–1942 | 1 |
| North American NA-44 | n/a | US | fighter/utility | 1940–1944 | 1 |
| North American Sabre | n/a | US | fighter | 1951–1953 | 1 |
| North American Yale | n/a | US | intermediate/radio trainer | 1940–1946 | 119 |
| Northrop Delta | n/a | Canada | transport/patrol | 1936–1945 | 20 |
| Northrop Nomad | n/a | US | light bomber | 1940–1945 | 32 |
| Percival Prentice | n/a | UK | trainer | 1948–1948 | 1 |
| Piasecki H-21A | CH-125 | US | utility/rescue helicopter | 1954–1973 | 18 |
| Piasecki Model 44A | CH-127 | US | utility/rescue helicopter | 1960–1972 | 5 |
| Pitcairn Mailwing | n/a | US | utility | 1928–1932 | 1 |
| Royal Aircraft Factory S.E.5a | n/a | UK | fighter | 1920–1929 | 12 |
| SAGEM Sperwer | CU-161 | France | UAV | 2003–current | 31 |
| Schweizer 2-12 | n/a | US | training glider | 1946–1949 | 2 |
| Sikorsky Cyclone (S-92) | CH-148 | US | anti-submarine warfare helicopter | not delivered | 0 |
| Sikorsky H-5 (S-51) | n/a | US | utility/rescue helicopter | 1947–1965 | 7 |
| Sikorsky H-19 (S-55) | n/a | US | utility/transport helicopter | 1954–1985 | 15 |
| Sikorsky H-34 (S-58) | CH-126 | US | utility/transport helicopter | 1955–1973 | 6 |
| Sikorsky Sea King (S-61) | CH-124 | US | Anti-submarine helicopter | 1968–current | 40 |
| Slingsby Firefly | CT-111 | UK | trainer | 1992–current | 12 |
| Sopwith Camel | n/a | UK | fighter | 1924–1929 | 10 |
| Sopwith Snipe | n/a | UK | fighter | 1919–1923 | 3 |
| Stearman Kaydet (Model 75) | n/a | US | elementary trainer | 1942–1943 | 301 |
| Stinson Voyager (Model 105) | n/a | US | utility | 1940–1946 | 25 |
| Supermarine Spitfire | n/a | UK | fighter | 1940–1950 | 8 |
| Supermarine Stranraer | n/a | Canada | patrol seaplane | 1938–1946 | 40 |
| Supermarine Walrus | n/a | UK | fleet spotter/utility amphibian | 1943–1947 | 8 |
| Vickers Viking Mk.IV | n/a | UK | patrol amphibian | 1923–1931 | 8 |
| Waco AQC-6 | n/a | US | utility | 1942–1942 | 1 |
| Waco CG-15A | n/a | US | transport glider | 1946–1950 | 1 |
| Waco Hadrian Mk.II | n/a | US | transport glider | 1944–1949 | 32 |
| Waco PG-2A | n/a | US | transport | 1946–1947 | 1 |
| Westland Lysander | n/a | UK/Canada | army co-operation/target tug | 1939–1946 | 329 |
| Westland Wapiti | n/a | UK | army co-operation | 1930–1944 | 25 |
Question:
how many airco dh.4's did the uk use in their period of service?
Answer:
12