| Cumulative | Cumulative | ||
| Number | Number | Percent | |
| After 3 Years (Summer 2003) | 139 | 139 | 30.1% |
| After 4 Years (Summer 2004) | 96 | 235 | 50.9% |
| After 5 Years (Summer 2005) | 21 | 256 | 55.4% |
| After 6 Years (Summer 2006) | 10 | 266 | 57.6% |
| After 7 Years (Summer 2007) | 5 | 271 | 58.7% |
| More than 7 Years (after Summer 2007) | 7 | 278 | 60.2% |
| Total | 278 | ||
| NOTE: Data is through August 2011. |
