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 |
| --- | --- | --- | --- | --- |
| Pennsylvania 1 | Bob Brady | Democratic | 1998.0 | Re-elected |
| Pennsylvania 2 | Chaka Fattah | Democratic | 1994.0 | Re-elected |
| Pennsylvania 3 | Phil English | Republican | 1994.0 | Re-elected |
| Pennsylvania 4 | Melissa Hart | Republican | 2000.0 | Lost re-election Democratic gain |
| Pennsylvania 5 | John Peterson | Republican | 1996.0 | Re-elected |
| Pennsylvania 6 | Jim Gerlach | Republican | 2002.0 | Re-elected |
| Pennsylvania 7 | Curt Weldon | Republican | 1986.0 | Lost re-election Democratic gain |
| Pennsylvania 8 | Mike Fitzpatrick | Republican | 2004.0 | Lost re-election Democratic gain |
| Pennsylvania 9 | Bill Shuster | Republican | 2001.0 | Re-elected |
| Pennsylvania 10 | Don Sherwood | Republican | 1998.0 | Lost re-election Democratic gain |
| Pennsylvania 11 | Paul Kanjorski | Democratic | 1984.0 | Re-elected |
| Pennsylvania 12 | John Murtha | Democratic | 1974.0 | Re-elected |
| Pennsylvania 13 | Allyson Schwartz | Democratic | 2004.0 | Re-elected |
| Pennsylvania 14 | Mike Doyle | Democratic | 1994.0 | Re-elected |
| Pennsylvania 15 | Charlie Dent | Republican | 2004.0 | Re-elected |
| Pennsylvania 16 | Joe Pitts | Republican | 1996.0 | Re-elected |
| Pennsylvania 17 | Tim Holden | Democratic | 1992.0 | Re-elected |
| Pennsylvania 18 | Tim Murphy | Republican | 2002.0 | Re-elected |
| Pennsylvania 19 | Todd Platts | Republican | 2000.0 | Re-elected |
Question:
What is the greatest first elected for Pennsylvania 10?
Answer:
1998.0