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:
| Senator | Party | District | Home Town | Took Office |
| --- | --- | --- | --- | --- |
| Bill Ratliff | Republican | 1.0 | Mount Pleasant | 1989.0 |
| Ted Lyon | Democratic | 2.0 | Mesquite | 1991.0 |
| Bill Haley | Democratic | 3.0 | Center | 1991.0 |
| Carl A. Parker | Democratic | 4.0 | Port Arthur | 1977.0 |
| Jim Turner | Democratic | 5.0 | Crockett | 1991.0 |
| Gene Green | Democratic | 6.0 | Houston | 1987.0 |
| Don Henderson | Republican | 7.0 | Houston | 1991.0 |
| O.H. "Ike" Harris | Republican | 8.0 | Dallas | 1967.0 |
| David Sibley | Republican | 9.0 | Waco | 1991.0 |
| Chris Harris | Republican | 10.0 | Arlington | 1991.0 |
| Chet Brooks | Democratic | 11.0 | Pasadena | 1967.0 |
| Mike Moncrief | Democratic | 12.0 | Fort Worth | 1991.0 |
| Craig A. Washington | Democratic | 13.0 | Houston | 1983.0 |
| Gonzalo Barrientos | Democratic | 14.0 | Austin | 1985.0 |
| John Whitmire | Democratic | 15.0 | Houston | 1983.0 |
| John N. Leedom | Republican | 16.0 | Dallas | 1981.0 |
| J. E. "Buster" Brown | Republican | 17.0 | Lake Jackson | 1981.0 |
| Ken Armbrister | Democratic | 18.0 | Victoria | 1987.0 |
| Frank Tejeda | Democratic | 19.0 | San Antonio | 1987.0 |
| Carlos F. Truan | Democratic | 20.0 | Corpus Christi | 1977.0 |
| Judith Zaffirini | Democratic | 21.0 | Laredo | 1987.0 |
| Bob Glasgow | Democratic | 22.0 | Stephenville | 1980.0 |
| Eddie Bernice Johnson | Democratic | 23.0 | Dallas | 1987.0 |
| Temple Dickson | Democratic | 24.0 | San Antonio | 1989.0 |
| Bill Sims | Democratic | 25.0 | San Antonio | 1983.0 |
| Cyndi Taylor Krier | Republican | 26.0 | San Antonio | 1985.0 |
| Eddie Lucio, Jr. | Democratic | 27.0 | Brownsville | 1991.0 |
| John Montford | Democratic | 28.0 | Lubbock | 1982.0 |
| Peggy Rosson | Democratic | 29.0 | El Paso | 1991.0 |
| Steve Carriker | Democratic | 30.0 | Roby | 1988.0 |
| Teel Bivins | Republican | 31.0 | Amarillo | 1989.0 |
Question:
What is the earliest date of taking office for district 22?
Answer:
1980.0