| Cumulative | Cumulative | ||
| Number | Number | Percent | |
| After 3 Years (Summer 2006) | 139 | 139 | 28.4% |
| After 4 Years (Summer 2007) | 99 | 238 | 48.7% |
| After 5 Years (Summer 2008) | 32 | 270 | 55.2% |
| After 6 Years (Summer 2009) | 25 | 295 | 60.3% |
| After 7 Years (Summer 2010) | 0 | 295 | 60.3% |
| More than 7 Years (after Summer 2010) | 3 | 298 | 60.9% |
| Total | 298 | ||
| NOTE: Data is through August 2011. |
