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:
|  | Year | Name | City | Country | Guests of Honor | Size |
| --- | --- | --- | --- | --- | --- | --- |
| 1st | 1939 | Nycon I | New York, New York | United States | Frank R. Paul | 200 |
| 2nd | 1940 | Chicon I | Chicago, Illinois | United States | E. E. "Doc" Smith | 128 |
| 3rd | 1941 | Denvention I | Denver, Colorado | United States | Robert A. Heinlein | 90 |
| 4th | 1946 | Pacificon I | Los Angeles, California | United States | A. E. van Vogt\nE. Mayne Hull | 130 |
| 5th | 1947 | Philcon I | Philadelphia, Pennsylvania | United States | John W. Campbell, Jr. | 200 |
| 6th | 1948 | Torcon I | Toronto, Ontario | Canada | Robert Bloch (Pro)\nBob Tucker (fan) | 200 |
| 7th | 1949 | Cinvention | Cincinnati, Ohio | United States | Lloyd A. Eshbach (pro)\nTed Carnell (fan) | 190 |
| 8th | 1950 | Norwescon | Portland, Oregon | United States | Anthony Boucher | 400 |
| 9th | 1951 | Nolacon I | New Orleans, Louisiana | United States | Fritz Leiber | 190 |
| 10th | 1952 | TASFiC (Chicon II) | Chicago, Illinois | United States | Hugo Gernsback | 870 |
| 11th | 1953 | Philcon II | Philadelphia, Pennsylvania | United States | Willy Ley | 750 |
| 12th | 1954 | SFCon | San Francisco, California | United States | John W. Campbell, Jr. | 700 |
| 13th | 1955 | Clevention | Cleveland, Ohio | United States | Isaac Asimov (pro)\nSam Moskowitz (mystery GoH) | 380 |
| 14th | 1956 | NyCon II | New York, New York | United States | Arthur C. Clarke | 850 |
| 15th | 1957 | Loncon I | London | UK | John W. Campbell, Jr. | 268 |
| 16th | 1958 | Solacon | South Gate, California | United States | Richard Matheson | 211 |
| 17th | 1959 | Detention | Detroit, Michigan | United States | Poul Anderson (pro)\nJohn Berry (fan) | 371 |
| 18th | 1960 | Pittcon | Pittsburgh, Pennsylvania | United States | James Blish | 568 |
| 19th | 1961 | Seacon | Seattle, Washington | United States | Robert A. Heinlein | 300 |
| 20th | 1962 | Chicon III | Chicago, Illinois | United States | Theodore Sturgeon | 730 |
| 21st | 1963 | Discon I | Washington, D.C. | United States | Murray Leinster | 600 |
| 22nd | 1964 | Pacificon II | Oakland, California | United States | Leigh Brackett (pro)\nEdmond Hamilton (pro)\nForrest J Ackerman (fan) | 523 |
| 23rd | 1965 | Loncon II | London | UK | Brian W. Aldiss | 350 |
| 24th | 1966 | Tricon | Cleveland, Ohio | United States | L. Sprague de Camp | 850 |
| 25th | 1967 | Nycon 3 | New York, New York | United States | Lester del Rey (pro)\nBob Tucker (fan) | 1,500 |
| 26th | 1968 | Baycon | Berkeley, California | United States | Philip José Farmer (pro)\nWalter J. Daugherty (fan) | 1,430 |
| 27th | 1969 | St. Louiscon | St. Louis, Missouri | United States | Jack Gaughan (pro)\nEddie Jones (fan) | 1,534 |
| 28th | 1970 | Heicon '70 | Heidelberg | West Germany | E.C. Tubb (UK)\nRobert Silverberg (US)\nHerbert W. Franke (Germany)\nElliot K. Shorter (fan) | 620 |
| 29th | 1971 | Noreascon I | Boston, Massachusetts | United States | Clifford D. Simak (pro)\nHarry Warner, Jr. (fan) | 1,600 |
| 30th | 1972 | L.A.con I | Los Angeles, California | United States | Frederik Pohl (pro)\nBuck & Juanita Coulson (fan) | 2,007 |
| 31st | 1973 | Torcon II | Toronto | Canada | Robert Bloch (Pro)\nWilliam Rotsler (fan) | 2,900 |
| 32nd | 1974 | Discon II | Washington, D.C. | United States | Roger Zelazny (pro)\nJay Kay Klein (fan) | 3,587 |
| 33rd | 1975 | Aussiecon 1 | Melbourne, Victoria | Australia | Ursula K. Le Guin (pro)\nSusan Wood (fan)\nMike Glicksohn (fan)\nDonald Tuck (Australian) | 606 |
| 34th | 1976 | MidAmeriCon | Kansas City, Missouri | United States | Robert A. Heinlein | 3,014 |
| 35th | 1977 | SunCon | Miami Beach, Florida | United States | Jack Williamson (pro)\nRobert A. Madle (fan) | 3,240\n(4,200) |
| 36th | 1978 | IguanaCon II | Phoenix, Arizona | United States | Harlan Ellison (pro)\nBill Bowers (fan) | 4,700 |
| 37th | 1979 | Seacon '79 | Brighton | UK | Brian Aldiss (UK)\nFritz Leiber (US)\nHarry Bell (fan) | 3,114 |
| 38th | 1980 | Noreascon Two | Boston, Massachusetts | United States | Damon Knight (pro)\nKate Wilhelm (pro)\nBruce Pelz (fan) | 5,850 |
| 39th | 1981 | Denvention Two | Denver, Colorado | United States | Clifford D. Simak (pro)\nC.L. Moore (pro)\nRusty Hevelin (fan) | 3,792 |
| 40th | 1982 | Chicon IV | Chicago, Illinois | United States | A. Bertram Chandler (pro)\nFrank Kelly Freas (pro)\nLee Hoffman (fan) | 4,275 |
| 41st | 1983 | ConStellation | Baltimore, Maryland | United States | John Brunner (pro)\nDavid A. Kyle (fan) | 6,400 |
| 42nd | 1984 | L.A.con II | Anaheim, California | United States | Gordon R. Dickson (pro)\nDick Eney (fan) | 8,365 |
| 43rd | 1985 | Aussiecon Two | Melbourne, Victoria | Australia | Gene Wolfe (pro)\nTed White (fan) | 1,599 |
| 44th | 1986 | ConFederation | Atlanta, Georgia | United States | Ray Bradbury (pro)\nTerry Carr (fan) | 5,811 |
| 45th | 1987 | Conspiracy '87 | Brighton | UK | Doris Lessing (UK)\nAlfred Bester (US)\nBoris and Arkady Strugatsky (USSR)\nJim Burns (artist)\nRay Harryhausen (film)\nJoyce and Ken Slater (fan)\nDavid Langford (special fan) | 4,009\n(5,425) |
| 46th | 1988 | Nolacon II | New Orleans, Louisiana | United States | Donald A. Wollheim (pro)\nRoger Sims (fan) | 5,300 |
| 47th | 1989 | Noreascon 3 | Boston, Massachusetts | United States | Andre Norton (pro)\nBetty and Ian Ballantine (pro)\nThe Stranger Club (fan) | 6,837\n(7,795) |
| 48th | 1990 | ConFiction | The Hague | Netherlands | Harry Harrison (pro)\nWolfgang Jeschke (pro)\nJoe Haldeman (pro)\nAndrew I. Porter (fan) | 3,580 |
| 49th | 1991 | Chicon V | Chicago, Illinois | United States | Hal Clement (pro)\nMartin H. Greenberg (pro)\nRichard Powers (pro)\nJon and Joni Stopa (fan) | 5,661 |
| 50th | 1992 | MagiCon | Orlando, Florida | United States | Jack Vance (pro)\nVincent Di Fate (artist)\nWalter A. Willis (fan) | 5,319\n(6,368) |
| 51st | 1993 | ConFrancisco | San Francisco, California | United States | Larry Niven\nAlicia Austin\nTom Digby (fan)\nJan Howard Finder\nMark Twain (Dead GoH) | 6,602 |
| 52nd | 1994 | ConAdian | Winnipeg | Canada | Anne McCaffrey (pro)\nGeorge Barr (artist)\nRobert Runte (fan) | 3,570\n(7,725) |
| 53rd | 1995 | Intersection | Glasgow, Scotland | UK | Samuel R. Delany (writer)\nGerry Anderson (media)\nLes Edwards (artist)\nVin¢ Clarke (fan) | 4,173\n(6,524) |
| 54th | 1996 | L.A.con III | Anaheim, California | United States | James White (writer)\nRoger Corman (media)\nElsie Wollheim (special)\nTakumi and Sachiko Shibano (fan) | 6,703 |
| 55th | 1997 | LoneStarCon 2 | San Antonio, Texas | United States | Algis Budrys (pro)\nMichael Moorcock (pro)\nDon Maitz (artist)\nRoy Tackett (fan) | 4,634\n(5,614) |
| 56th | 1998 | BucConeer | Baltimore, Maryland | United States | C. J. Cherryh\nMilton A. Rothman\nStanley Schmidt\nMichael Whelan\nJ. Michael Straczynski (special) | 6,572 |
| 57th | 1999 | Aussiecon Three | Melbourne, Victoria | Australia | Gregory Benford, author\nGeorge Turner, author\nBruce Gillespie, fan | 1,626\n(2,872) |
| 58th | 2000 | Chicon 2000 | Chicago, Illinois | United States | Ben Bova (author)\nBob Eggleton (artist)\nJim Baen (editor)\nBob & Anne Passovoy (fan) | 5,794\n(6,574) |
| 59th | 2001 | Millennium Philcon | Philadelphia, Pennsylvania | United States | Greg Bear (author)\nStephen Youll (artist)\nGardner Dozois (editor)\nGeorge H. Scithers (fan) | 4,840\n(6,269) |
| 60th | 2002 | ConJosé | San Jose, California | United States | Vernor Vinge (author)\nDavid Cherry (artist)\nBjo & John Trimble (fan)\nFerdinand Feghoot (imaginary) | 5,162\n(5,916) |
| 61st | 2003 | Torcon 3 | Toronto | Canada | George R. R. Martin (author)\nFrank Kelly Freas (artist)\nMike Glyer (fan)\nRobert Bloch (GoHst of Honor) | 3,834\n(4,986) |
| 62nd | 2004 | Noreascon 4 | Boston, Massachusetts | United States | Terry Pratchett (pro)\nWilliam Tenn (pro)\nJack Speer (fan)\nPeter Weston (fan) | 5,651\n(7,485) |
| 63rd | 2005 | Interaction | Glasgow, Scotland | UK | Greg Pickersgill\nChristopher Priest\nRobert Sheckley\nLars-Olov Strandberg\nJane Yolen | 4,115\n(5,202) |
| 64th | 2006 | L.A.con IV | Anaheim, California | United States | Connie Willis (Author)\nJames Gurney (Artist)\nHoward DeVore (fan)\nFrankie Thomas (Special) | 5,738\n(6,291) |
| 65th | 2007 | Nippon 2007 | Yokohama | Japan | Sakyo Komatsu (author)\nDavid Brin (author)\nTakumi Shibano (fan)\nYoshitaka Amano (artist)\nMichael Whelan (artist) | 3,348\n(5,149) |
| 66th | 2008 | Denvention 3 | Denver, Colorado | United States | Lois McMaster Bujold (pro)\nTom Whitmore (fan)\nRick Sternbach (artist) | 3,752 |
| 67th | 2009 | Anticipation | Montréal, Québec | Canada | Neil Gaiman (pro)\nElisabeth Vonarburg (pro)\nTaral Wayne (fan)\nDavid Hartwell (editor)\nTom Doherty (publisher) | 3,925\n(4,499) |
| 68th | 2010 | Aussiecon Four | Melbourne, Victoria | Australia | Kim Stanley Robinson (author)\nRobin Johnson (fan)\nShaun Tan (artist) | 2,101\n(3,462) |
| 69th | 2011 | Renovation | Reno, Nevada | United States | Tim Powers\nEllen Asher\nBoris Vallejo\nCharles N. Brown (in memoriam) | 4,112\n(5,526) |
| 70th | 2012 | Chicon 7 | Chicago, Illinois | United States | Mike Resnick (author)\nRowena Morrill (artist)\nStory Musgrave (astronaut)\nPeggy Rae Sapienza (fan)\nJane Frank (agent)\nSy Liebergot (special guest)\nJohn Scalzi (toastmaster) | 4,743\n(6,197) |
| 71st | 2013 | LoneStarCon 3 | San Antonio, Texas | United States | Ellen Datlow\nJames Gunn\nWillie Siros\nNorman Spinrad\nDarrell K. Sweet (in memoriam)\nPaul Cornell (toastmaster)\nLeslie Fish\nJoe R. Lansdale | 4,311\n(6,060) |
| 72nd | 2014 | Loncon 3 | London | UK | Iain M. Banks (in memoriam)\nJohn Clute\nChris Foss\nMalcolm Edwards\nJeanne Gomoll\nRobin Hobb\nBryan Talbot |  |
| 73rd | 2015 | Sasquan | Spokane, Washington | United States | Brad Foster\nDavid Gerrold\nVonda McIntyre\nTom Smith\nLeslie Turek |  |
Question:
before 1970 how many conventions had more than 1,000 attendees?
Answer:
3