| Cumulative | Cumulative | ||
| Number | Number | Percent | |
| After 3 Years (Summer 2004) | 145 | 145 | 32.6% |
| After 4 Years (Summer 2005) | 73 | 218 | 49.0% |
| After 5 Years (Summer 2006) | 43 | 261 | 58.7% |
| After 6 Years (Summer 2007) | 20 | 281 | 63.1% |
| After 7 Years (Summer 2008) | 9 | 290 | 65.2% |
| More than 7 Years (after Summer 2008) | 9 | 299 | 67.2% |
| Total | 299 | ||
| NOTE: Data is through August 2011. |
