| Patient Status | Year | |||||||||
| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | |
| Total | 71 | 82 | 81 | 89 | 95 | 107 | 141 | 168 | 183 | 172 |
| Active | 66 | 69 | 71 | 71 | 65 | 75 | 107 | 133 | 141 | 128 |
| Inactive | 5 | 13 | 10 | 18 | 30 | 32 | 34 | 35 | 42 | 44 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| Active | 93.0% | 84.1% | 87.7% | 79.8% | 68.4% | 70.1% | 75.9% | 79.2% | 77.0% | 74.4% |
| Inactive | 7.0% | 15.9% | 12.3% | 20.2% | 31.6% | 29.9% | 24.1% | 20.8% | 23.0% | 25.6% |