| Cumulative | Cumulative | ||
| Number | Number | Percent | |
| After 3 Years (Summer 2005) | 144 | 144 | 32.7% |
| After 4 Years (Summer 2006) | 77 | 221 | 50.2% |
| After 5 Years (Summer 2007) | 31 | 252 | 57.3% |
| After 6 Years (Summer 2008) | 12 | 264 | 60.0% |
| After 7 Years (Summer 2009) | 3 | 267 | 60.7% |
| More than 7 Years (after Summer 2009) | 8 | 275 | 62.5% |
| Total | 275 | ||
| NOTE: Data is through August 2011. |
