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:
| School | Location | Mascot | County | Year Joined | Year Left | Conference Joined |
| --- | --- | --- | --- | --- | --- | --- |
| Avon | Avon | Orioles | 32 Hendricks | 1974.0 | 2000.0 | Hoosier Crossroads |
| Beech Grove | Beech Grove | Hornets | 49 Marion | 1978.0 | 2005.0 | Indiana Crossroads |
| Brownsburg | Brownsburg | Bulldogs | 32 Hendricks | 1942.0 | 1967.0 | Sagamore |
| Center Grove | Greenwood | Trojans | 41 Johnson | 1956.0 | 1981.0 | Central Suburban |
| Danville | Danville | Warriors | 32 Hendricks | 1942.0 | 1978.0 | West Central |
| Decatur Central | Indianapolis | Hawks | 49 Marion | 1942.0 | 1971.0 | Central Suburban |
| Lawrence Central | Indianapolis | Bears | 49 Marion | 1942.0 | 1949.0 | Capital District |
| Speedway | Speedway | Sparkplugs | 49 Marion | 1942.0 | 1999.0 | West Central |
Question:
What's the highest Year Left for the School of Danville?
Answer:
1978.0