| Years | Distress | Healthy | Total | Distress % | Healthy % |
| 2001-2003 | 44 | 136 | 180 | 24.44% | 75.56% |
| 2002-2004 | 25 | 174 | 199 | 12.56% | 87.44% |
| 2003-2005 | 40 | 530 | 570 | 7.02% | 92.98% |
| 2004-2006 | 77 | 593 | 670 | 11.49% | 88.51% |
| 2005-2007 | 77 | 612 | 689 | 11.18% | 88.82% |