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 |
| --- | --- | --- | --- | --- |
| Illinois 1 | Bobby Rush | Democratic | 1992.0 | Re-elected |
| Illinois 2 | Jesse Jackson, Jr. | Democratic | 1995.0 | Re-elected |
| Illinois 3 | Dan Lipinski | Democratic | 2004.0 | Re-elected |
| Illinois 4 | Luis Gutierrez | Democratic | 1992.0 | Re-elected |
| Illinois 5 | Rahm Emanuel | Democratic | 2002.0 | Re-elected |
| Illinois 6 | Henry Hyde | Republican | 1974.0 | Retired Republican hold |
| Illinois 7 | Danny Davis | Democratic | 1996.0 | Re-elected |
| Illinois 8 | Melissa Bean | Democratic | 2004.0 | Re-elected |
| Illinois 9 | Jan Schakowsky | Democratic | 1998.0 | Re-elected |
| Illinois 10 | Mark Kirk | Republican | 2000.0 | Re-elected |
| Illinois 11 | Jerry Weller | Republican | 1994.0 | Re-elected |
| Illinois 12 | Jerry Costello | Democratic | 1988.0 | Re-elected |
| Illinois 13 | Judy Biggert | Republican | 1998.0 | Re-elected |
| Illinois 14 | Dennis Hastert | Republican | 1986.0 | Re-elected |
| Illinois 15 | Tim Johnson | Republican | 2000.0 | Re-elected |
| Illinois 16 | Donald Manzullo | Republican | 1992.0 | Re-elected |
| Illinois 17 | Lane Evans | Democratic | 1982.0 | Retired Democratic hold |
| Illinois 18 | Ray LaHood | Republican | 1994.0 | Re-elected |
| Illinois 19 | John Shimkus | Republican | 1996.0 | Re-elected |
Question:
What is re-elected Incumbent Jerry Costello's First elected date?
Answer:
1988.0