| Cumulative | Cumulative | ||
| Number | Number | Percent | |
| After 1 Year (Summer 1998) | 6 | 6 | 3.9% |
| After 2 Years (Summer 1999) | 20 | 26 | 16.9% |
| After 3 Years (Summer 2000) | 6 | 32 | 20.8% |
| After 4 Years (Summer 2001) | 7 | 39 | 25.3% |
| After 5 Years (Summer 2002) | 6 | 45 | 29.2% |
| After 6 Years (Summer 2003) | 6 | 51 | 33.1% |
| After 7 Years (Summer 2004) | 6 | 57 | 37.0% |
| More than 7 Years (after Summer 2004) | 5 | 62 | 40.3% |
| Total | 62 | ||
| NOTE: Data is through Summer 2011 |
