| Cumulative | Cumulative | ||
| Number | Number | Percent | |
| After 1 Year (Summer 1999) | 6 | 6 | 4.4% |
| After 2 Years (Summer 2000) | 13 | 19 | 13.9% |
| After 3 Years (Summer 2001) | 11 | 30 | 21.9% |
| After 4 Years (Summer 2002) | 6 | 36 | 26.3% |
| After 5 Years (Summer 2003) | 10 | 46 | 33.6% |
| After 6 Years (Summer 2004) | 7 | 53 | 38.7% |
| After 7 Years (Summer 2005) | 3 | 56 | 40.9% |
| More than 7 Years (after Summer 2005) | 7 | 63 | 46.0% |
| Total | 63 | ||
| NOTE: Data is through Summer 2011 |
