| Cumulative | Cumulative | ||
| Number | Number | Percent | |
| After 1 Year (Summer 2001) | 6 | 6 | 3.2% |
| After 2 Years (Summer 2002) | 24 | 30 | 16.1% |
| After 3 Years (Summer 2003) | 7 | 37 | 19.9% |
| After 4 Years (Summer 2004) | 2 | 39 | 21.0% |
| After 5 Years (Summer 2005) | 22 | 61 | 32.8% |
| After 6 Years (Summer 2006) | 5 | 66 | 35.5% |
| After 7 Years (Summer 2007) | 7 | 73 | 39.2% |
| More than 7 Years (after Summer 2007) | 5 | 78 | 41.9% |
| Total | 78 | ||
| NOTE: Data is through Summer 2011 |
