| Patient Status | Year | |||||||||
| 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | |
| Total | 132 | 164 | 182 | 201 | 221 | 272 | 248 | 315 | 387 | 408 |
| Active | 5 | 15 | 87 | 114 | 138 | 170 | 123 | 193 | 261 | 288 |
| Inactive | 29 | 40 | 61 | 78 | 78 | 102 | 125 | 122 | 126 | 120 |
| Unknown | 98 | 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 | 3.8% | 9.1% | 47.8% | 56.7% | 62.4% | 62.5% | 49.6% | 61.3% | 67.4% | 70.6% |
| Inactive | 22.0% | 24.4% | 33.5% | 38.8% | 35.3% | 37.5% | 50.4% | 38.7% | 32.6% | 29.4% |
| Unknown | 74.2% | 66.5% | 18.7% | 4.5% | 2.3% | - | - | - | - | - |