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:
| District | Incumbent | Party | First elected | Results |
| --- | --- | --- | --- | --- |
| California 1 | Mike Thompson | Democratic | 1998.0 | Re-elected |
| California 2 | Wally Herger | Republican | 1988.0 | Re-elected |
| California 3 | Dan Lungren | Republican | 1998.0 | Re-elected |
| California 4 | John Doolittle | Republican | 1990.0 | Re-elected |
| California 5 | Doris Matsui | Democratic | 2005.0 | Re-elected |
| California 6 | Lynn Woolsey | Democratic | 1992.0 | Re-elected |
| California 7 | George Miller | Democratic | 1974.0 | Re-elected |
| California 8 | Nancy Pelosi | Democratic | 1987.0 | Re-elected |
| California 9 | Barbara Lee | Democratic | 1998.0 | Re-elected |
| California 10 | Ellen Tauscher | Democratic | 1996.0 | Re-elected |
| California 11 | Richard Pombo | Republican | 1992.0 | Lost re-election Democratic gain |
| California 12 | Tom Lantos | Democratic | 1980.0 | Re-elected |
| California 13 | Pete Stark | Democratic | 1972.0 | Re-elected |
| California 14 | Anna Eshoo | Democratic | 1992.0 | Re-elected |
| California 15 | Mike Honda | Democratic | 2000.0 | Re-elected |
| California 16 | Zoe Lofgren | Democratic | 1994.0 | Re-elected |
| California 17 | Sam Farr | Democratic | 1992.0 | Re-elected |
| California 18 | Dennis Cardoza | Democratic | 2002.0 | Re-elected |
| California 19 | George Radanovich | Republican | 1996.0 | Re-elected |
| California 20 | Jim Costa | Democratic | 2004.0 | Re-elected |
| California 21 | Devin Nunes | Republican | 2000.0 | Re-elected |
| California 22 | Bill Thomas | Republican | 1978.0 | Retired Republican hold |
| California 23 | Lois Capps | Democratic | 1998.0 | Re-elected |
| California 24 | Elton Gallegly | Republican | 1986.0 | Re-elected |
| California 25 | Howard McKeon | Republican | 1992.0 | Re-elected |
| California 26 | David Dreier | Republican | 1980.0 | Re-elected |
| California 27 | Brad Sherman | Democratic | 1996.0 | Re-elected |
| California 28 | Howard Berman | Democratic | 1982.0 | Re-elected |
| California 29 | Adam Schiff | Democratic | 2000.0 | Re-elected |
| California 30 | Henry Waxman | Democratic | 1974.0 | Re-elected |
| California 31 | Xavier Becerra | Democratic | 1992.0 | Re-elected |
| California 32 | Hilda Solis | Democratic | 2000.0 | Re-elected |
| California 33 | Diane Watson | Democratic | 2001.0 | Re-elected |
| California 34 | Lucille Roybal-Allard | Democratic | 1992.0 | Re-elected |
| California 35 | Maxine Waters | Democratic | 1990.0 | Re-elected |
| California 36 | Jane Harman | Democratic | 1986.0 | Re-elected |
| California 37 | Juanita Millender-McDonald | Democratic | 1996.0 | Re-elected |
| California 38 | Grace Napolitano | Democratic | 1998.0 | Re-elected |
| California 39 | Linda Sánchez | Democratic | 2002.0 | Re-elected |
| California 40 | Ed Royce | Republican | 1992.0 | Re-elected |
| California 41 | Jerry Lewis | Republican | 1978.0 | Re-elected |
| California 42 | Gary Miller | Republican | 1998.0 | Re-elected |
| California 43 | Joe Baca | Democratic | 1999.0 | Re-elected |
| California 44 | Ken Calvert | Republican | 1992.0 | Re-elected |
| California 45 | Mary Bono | Republican | 1998.0 | Re-elected |
| California 46 | Dana Rohrabacher | Republican | 1988.0 | Re-elected |
| California 47 | Loretta Sanchez | Democratic | 1996.0 | Re-elected |
| California 48 | John Campbell | Republican | 2005.0 | Re-elected |
| California 49 | Darrell Issa | Republican | 2000.0 | Re-elected |
| California 50 | Brian Bilbray | Republican | 2006.0 | Re-elected |
| California 51 | Bob Filner | Democratic | 1992.0 | Re-elected |
| California 52 | Duncan Hunter | Republican | 1980.0 | Re-elected |
| California 53 | Susan Davis | Democratic | 2000.0 | Re-elected |
Question:
What is the earliest first elected date of incumbent howard mckeon?
Answer:
1992.0