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:
| Rank | Badge/Serial Number | Tenure | Date of death | Cause of death |
| --- | --- | --- | --- | --- |
| City Marshal | — | — | 1853 | Gunfire |
| City Marshal /Police Chief | — | — | 1870-10-31 | Gunfire |
| Policeman | — | 1 year | 1907-02-28 | Gunfire |
| Policeman | — | 4 months | 1907-11-30 | Gunfire |
| Captain | — | 21 years | 1908-09-09 | Gunfire |
| Policeman | — | — | 1910-04-08 | Gunfire |
| Policeman | — | — | 1911-05-25 | Gunfire |
| Policeman | — | — | 1911-06-08 | Struck by train |
| Policeman | — | — | 1911-11-27 | Car accident |
| Policeman | — | — | 1911-12-25 | Gunfire |
| Policeman | — | — | 1914-03-31 | Struck by streetcar |
| Policeman | — | — | 1914-09-23 | Gunfire |
| Sergeant | — | 9 years | 1915-10-19 | Gunfire |
| Detective Lieutenant | — | — | 1915-11-29 | Gunfire |
| Policeman | — | — | 1916-03-28 | Motorcycle accident |
| Detective | — | 8 years, 10 months | 1916-06-17 | Heatstroke |
| Policeman | — | 12 years | 1916-12-15 | Gunfire |
| Policeman | — | — | 1917-09-04 | Car accident |
| Lieutenant | — | — | 1917-11-13 | Fall |
| Policeman | — | — | 1917-11-21 | Fire |
| Policeman | — | — | 1919-02-18 | Gunfire |
| Policeman | — | — | 1919-08-27 | Motorcycle accident |
| Policeman | — | — | 1919-09-22 | Car accident |
| Policeman | — | — | 1920-05-21 | Car accident |
| Policeman | — | — | 1920-05-24 | Gunfire |
| Policeman | — | — | 1920-06-15 | Motorcycle accident |
| Policeman | — | — | 1921-02-11 | Motorcycle accident |
| Detective Sergeant | — | — | 1921-06-18 | Gunfire |
| Policeman | — | — | 1921-12-06 | Gunfire |
| Detective Sergeant | — | — | 1922-04-08 | Car accident |
| Policeman | — | — | 1922-11-04 | Gunfire |
| Policeman | 567 | 3 years | 1923-01-13 | Gunfire |
| Policeman | — | — | 1923-01-22 | Gunfire |
| Policeman | 468 | 3 years | 1923-01-22 | Struck by train |
| Policeman | — | — | 1924-01-11 | Car accident |
| Policeman | — | — | 1924-02-20 | Gunfire |
| Policeman | — | — | 1924-07-27 | Motorcycle accident |
| Policeman | — | — | 1924-08-20 | Gunfire |
| Policeman | — | — | 1924-08-24 | Gunfire |
| Policeman | — | — | 1925-04-11 | Motorcycle accident |
| Policeman | — | — | 1925-08-22 | Gunfire |
| Policeman | — | — | 1926-02-08 | Gunfire |
| Policeman | — | — | 1926-02-23 | Gunfire (accidental) |
| Policeman | — | — | 1926-03-14 | Gunfire |
| Policeman | — | — | 1926-05-16 | Car accident |
| Policeman | — | — | 1927-01-23 | Motorcycle accident |
| Policeman | — | 2 years, 6 months | 1927-01-25 | Gunfire |
| Policeman | — | 3 years | 1927-03-23 | Gunfire |
| Sergeant | — | — | 1927-07-07 | Struck by vehicle |
| Policeman | — | — | 1928-03-28 | Gunfire |
| Policeman | — | — | 1928-09-29 | Gunfire |
| Policeman | — | — | 1929-02-27 | Car accident |
| Policeman | — | — | 1929-04-18 | Car accident |
| Policeman | — | — | 1930-03-31 | Gunfire |
| Policeman | — | 10 years | 1930-04-13 | Gunfire |
| Policeman | — | — | 1930-05-10 | Gunfire |
| Policeman | — | — | 1931-01-28 | Gunfire |
| Policeman | — | — | 1931-03-01 | Motorcycle accident |
| Policeman | — | — | 1932-01-11 | Gunfire |
| Policeman | — | — | 1932-04-28 | Gunfire |
| Detective Lieutenant | — | — | 1932-12-20 | Gunfire |
| Policeman | — | — | 1933-10-21 | Car accident |
| Policeman | — | — | 1934-07-24 | Gunfire |
| Policeman | — | — | 1935-06-16 | Motorcycle accident |
| Policeman | — | — | 1935-10-20 | Gunfire |
| Policeman | 97 | 12 years, 6 months | 1936-02-17 | Gunfire |
| Sergeant | — | — | 1936-11-09 | Struck by train |
| Policeman | — | — | 1937-03-10 | Motorcycle accident |
| Policeman | — | 14 years | 1937-07-09 | Struck by train |
| Policeman | — | — | 1937-08-30 | Car accident |
| Policeman | — | 18 years | 1938-01-18 | Struck by vehicle |
| Lieutenant | — | — | 1938-05-22 | Gunfire |
| Policeman | — | — | 1938-09-09 | Car accident |
| Lieutenant | — | — | 1939-01-12 | Motorcycle accident |
| Policeman | — | — | 1939-09-13 | Motorcycle accident |
| Policeman | — | — | 1940-05-26 | Electrocution (accidental) |
| Policeman | 1959 | — | 1941-07-15 | Car accident |
| Policeman | 405 | 16 years | 1941-08-18 | Motorcycle accident |
| Policeman | 469 | — | 1941-09-24 | Car accident |
| Policeman | 2472 | — | 1941-12-25 | Motorcycle accident |
| Detective | 277 | — | 1942-03-08 | Gunfire |
| Policeman | 496 | — | 1942-12-31 | Gunfire |
| Policeman | 2015 | — | 1944-03-04 | Heart attack |
| Sergeant | 232 | — | 1945-03-16 | Gunfire (accidental) |
| Sergeant | 2440 | — | 1945-10-14 | Motorcycle accident |
| Policeman | 7425 | — | 1945-12-31 | Gunfire |
| Policeman | 2650 | — | 1946-02-01 | Gunfire |
| Policeman | 1125 | 18 years | 1946-02-04 | Gunfire |
| Reserve Policeman | — | — | 1946-08-07 | Gunfire |
| Policeman | 7605 | — | 1947-04-04 | Gunfire |
| Policeman | 3641 | — | 1947-10-07 | Motorcycle accident |
| Policeman | 3757 | — | 1947-12-05 | Gunfire |
| Policeman | 3378 | — | 1948-12-06 | Gunfire |
| Detective Sergeant | 1364 | 21 years | 1949-05-16 | Gunfire |
| Policeman | 5049 | 3 years | 1950-05-11 | Gunfire |
| Policeman | 3277 | — | 1950-07-08 | Motorcycle accident |
| Policeman | 5043 | — | 1950-10-21 | Motorcycle accident |
| Policeman | 4602 | — | 1951-04-05 | Motorcycle accident |
| Policeman | 4230 | — | 1951-09-30 | Motorcycle accident |
| Sergeant | 3969 | — | 1952-02-15 | Gunfire |
| Policeman | 2942 | — | 1952-03-03 | Car accident |
| Policeman | 3975 | — | 1952-08-24 | Motorcycle accident |
| Policeman | 4350 | — | 1954-06-22 | Car accident |
| Detective | 1007 | — | 1955-02-22 | Car accident |
| Policeman | 4227 | 10 years | 1956-09-07 | Motorcycle accident |
| Policeman | — | 11 years | 1957-01-13 | Heart attack |
| Policeman | 5298 | — | 1957-03-17 | Gunfire |
| Policeman | 3890 | — | 1957-10-14 | Gunfire |
| Policeman | — | — | 1958-06-20 | Gunfire |
| Policeman | 7044 | — | 1958-07-26 | Car accident |
| Detective Sergeant | 5771 | — | 1958-10-20 | Gunfire |
| Detective | 6517 | — | 1959-03-05 | Gunfire |
| Policeman | 3860 | — | 1959-04-05 | Gunfire |
| Policeman | 5787 | — | 1959-05-04 | Car accident |
| Policeman | 7488 | — | 1959-12-26 | Motorcycle accident |
| Policeman | 7169 | 2 years | 1960-12-08 | Gunfire |
| Policeman | 4299 | 15 years | 1961-05-06 | Gunfire |
| Policeman | 6935 | — | 1960-09-14 | Motorcycle accident |
| Policeman | 5976 | — | 1961-11-30 | Motorcycle accident |
| Policeman | 10733 | 1 year, 5 months | 1962-07-26 | Vehicular assault |
| Policeman | 10046 | — | 1963-03-09 | Gunfire |
| Detective | 6221 | — | 1964-02-01 | Gunfire |
| Detective Sergeant | 6078 | — | 1964-02-01 | Gunfire |
| Sergeant | 6090 | — | 1964-11-30 | Helicopter accident |
| Policeman | 12151 | 11 months | 1965-10-06 | Gunfire |
| Policeman M/C Officer | 10395 | — | 1966-03-02 | Struck by drunk driver |
| Sergeant | 12613 | — | 1966-08-29 | Vehicular assault |
| Policeman | 3490 | — | 1966-08-30 | Helicopter accident |
| Policeman | 10668 | 4 years, 7 months | 1966-08-30 | Helicopter accident |
| Policeman | 10657 | 6 years | 1966-10-27 | Gunfire |
| Policeman | 433 | 1 month | 1967-05-08 | Gunfire |
| Policeman | 11895 | 3 years | 1968-02-10 | Struck by vehicle |
| Policeman | 12111 | 4 years | 1968-02-10 | Gunfire |
| Policeman | 14037 | 2 days | 1968-09-09 | Gunfire |
| Policeman | 13991 | 1 year, 3 months | 1969-07-31 | Gunfire |
| Policeman | 14317 | — | 1969-08-19 | Gunfire |
| Policeman | 14169 | 2 years | 1970-04-23 | Gunfire |
| Policeman | 13031 | — | 1970-08-18 | Car accident |
| Policeman | 14745 | — | 1971-10-21 | Gunfire |
| Policeman | 16849 | — | 1972-03-27 | Car accident |
| Policeman | 12552 | — | 1973-03-23 | Gunfire |
| Policeman | 10285 | 14 years | 1973-06-21 | Gunfire |
| Policeman | 10502 | 13 years | 1973-07-09 | Motorcycle accident |
| Detective | 11797 | — | 1973-11-06 | Gunfire |
| Officer | 15444 | 5 years | 1974-05-11 | Gunfire |
| Commander | 6435 | — | 1974-05-29 | Helicopter accident |
| Officer | 14028 | — | 1975-01-19 | Motorcycle accident |
| Officer | 16208 | 5 years | 1975-09-22 | Vehicle pursuit |
| Officer | 15485 | 9 years | 1976-02-12 | Gunfire |
| Officer | 14388 | 7 years | 1976-06-11 | Helicopter accident |
| Officer | 12035 | 12 years | 1976-08-17 | Gunfire |
| Officer | 21939 | — | 1977-10-21 | Gunfire |
| Officer | 14818 | 10 years | 1979-08-02 | Vehicular assault |
| Officer | 22123 | 1 year, 6 months | 1979-09-27 | Gunfire |
| Detective | 11389 | — | 1980-03-10 | Gunfire (accidental) |
| Officer | — | 17 years | 1980-11-26 | Heart attack |
| Officer | 22154 | — | 1981-05-31 | Car accident |
| Officer | 13383 | — | 1982-10-10 | Gunfire |
| Reserve Officer | — | — | 1983-03-01 | Helicopter accident |
| Officer | 15086 | — | 1983-06-02 | Gunfire |
| Officer | 12023 | — | 1983-10-22 | Motorcycle accident |
| Officer | 21730 | — | 1983-10-29 | Vehicular assault |
| Officer | 22205 | — | 1983-10-29 | Vehicular assault |
| Officer | 23431 | 3 years | 1984-12-19 | Gunfire |
| Detective | 17491 | 13 years | 1985-10-31 | Gunfire |
| Detective | 12241 | — | 1986-02-08 | Explosives ; Pipe bomb |
| Officer | 15323 | — | 1986-02-08 | Explosives ; Pipe bomb |
| Officer | 14473 | — | 1987-06-02 | Motorcycle accident |
| Officer III | 23759 | 5 years | 1987-06-22 | Gunfire |
| Officer | 25532 | 9 months | 1988-06-07 | Gunfire |
| Officer | 23800 | 6 months | 1988-09-03 | Gunfire |
| Officer | 25472 | — | 1988-12-12 | Car accident |
| Officer | 24654 | — | 1988-12-12 | Car accident |
| Officer | 24984 | — | 1988-12-12 | Car accident |
| Detective | 16032 | 19 years | 1989-04-19 | Gunfire |
| Detective | 11755 | 9 years | 1989-12-27 | Gunfire |
| Detective | 12884 | 24 years, 6 months | 1990-10-09 | Gunfire |
| Officer | 27606 | 10 months | 1991-02-11 | Gunfire |
| Officer | 20393 | 17 years | 1991-06-13 | Helicopter accident |
| Officer | 16805 | 20 years | 1991-06-13 | Helicopter accident |
| Detective | 20625 | 18 years, 6 months | 1991-06-13 | Gunfire |
| Officer | 22940 | 11 years, 6 months | 1991-10-22 | Motorcycle accident |
| Officer | 24558 | 8 years, 6 months | 1992-12-16 | Motorcycle accident |
| Officer | 24216 | 10 years | 1993-01-20 | Bicycle accident |
| Officer | 13994 | 26 years | 1994-01-17 | Motorcycle accident |
| Officer | 30433 | 2 months | 1994-02-22 | Gunfire |
| Officer | 24265 | 11 years | 1994-10-22 | Gunfire |
| Officer | 31314 | 1 year | 1995-11-04 | Vehicular assault |
| Officer II | 31588 | 1 year | 1996-12-22 | Gunfire |
| Officer II | 25561 | 9 years | 1997-02-05 | Motorcycle accident |
| Officer II | 27686 | 7 years | 1998-01-01 | Gunfire |
| Officer II | 30753 | 4 years | 1998-08-09 | Gunfire |
| Officer III | 32054 | 3 years | 1998-11-29 | Gunfire |
| Officer III | 16237 | 29 years | 2000-03-17 | Fall |
| Officer II | 32571 | 6 years | 2000-09-19 | Car accident |
| Officer | 26827 | 3 years | 2001-12-09 | Gunfire (accidental) |
| Detective I | 24314 | 19 years | 2003-06-25 | Car accident |
| Officer | 36046 | 2 years, 6 months | 2004-02-20 | Gunfire |
| Officer II | 37029 | 9 years, 6 months | 2006-10-22 | Car accident |
| Officer III+I | 22885 | 27 years | 2008-02-07 | Gunfire |
| Officer III | 35928 | 7 years, 7 months | 2008-09-12 | Train accident |
Question:
What is the Tenure of the Officer who died in a helicopter accident with Badge/Serial Number 16805?
Answer:
20 years