| Patient Status | Year | |||||||||
| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | |
| Total | 164 | 181 | 201 | 221 | 272 | 246 | 312 | 383 | 403 | 452 |
| Active | 15 | 86 | 114 | 138 | 170 | 123 | 193 | 259 | 285 | 301 |
| Inactive | 40 | 61 | 78 | 78 | 102 | 123 | 119 | 124 | 118 | 151 |
| Unknown | 109 | 34 | 9 | 5 | - | - | - | - | - | - |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| Active | 9.1% | 47.5% | 56.7% | 62.4% | 62.5% | 50.0% | 61.9% | 67.6% | 70.7% | 66.6% |
| Inactive | 24.4% | 33.7% | 38.8% | 35.3% | 37.5% | 50.0% | 38.1% | 32.4% | 29.3% | 33.4% |
| Unknown | 66.5% | 18.8% | 4.5% | 2.3% | - | - | - | - | - | - |