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 | Counties Represented | Party | First Elected | Committee |
| --- | --- | --- | --- | --- |
| 05.2 5B | Carroll, Baltimore County | Republican | 1974.0 | Health and Government Operations |
| 06.0 6 | Baltimore County | Democratic | 1988.0 | Economic Matters |
| 06.0 6 | Baltimore County | Democratic | 2006.0 | Economic Matters |
| 06.0 6 | Baltimore County | Democratic | 2002.0 | Environmental Matters |
| 07.0 7 | Baltimore County, Harford | Republican | 2002.0 | Economic Matters |
| 07.0 7 | Baltimore County, Harford | Republican | 2002.0 | Ways and Means |
| 07.0 7 | Baltimore County, Harford | Republican | 1978.0 | Health and Government Operations |
| 08.0 8 | Baltimore County | Democratic | 2006.0 | Judiciary |
| 08.0 8 | Baltimore County | Democratic | 2002.0 | Health and Government Operations |
| 08.0 8 | Baltimore County | Republican | 2002.0 | Environmental Matters |
| 10 | Baltimore County | Democratic | 1994.0 | Economic Matters |
| 10 | Baltimore County | Democratic | 1997.0 | Appropriations |
| 10 | Baltimore County | Democratic | 1994.0 | Health and Government Operations |
| 11 | Baltimore County | Democratic | 2002.0 | Ways and Means |
| 11 | Baltimore County | Democratic | 1994.0 | Health and Government Operations |
| 11 | Baltimore County | Democratic | 2002.0 | Environmental Matters |
| 12.1 12A | Baltimore County, Howard | Democratic | 2002.0 | Appropriations |
| 12.1 12A | Baltimore County, Howard | Democratic | 1994.0 | Environmental Matters (Vice-Chair) |
| 42 | Baltimore County | Democratic | 2006.0 | Environmental Matters |
| 42 | Baltimore County | Republican | 2002.0 | Appropriations |
| 42 | Baltimore County | Republican | 2002.0 | Judiciary |
Question:
What is the average first elected year that has a district of 11 and a committee of environmental matters?
Answer:
2002.0