| Patient Status | Year | |||||||||
| 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | |
| Total | 192 | 201 | 202 | 237 | 228 | 251 | 223 | 202 | 209 | 198 |
| Active | 15 | 14 | 143 | 168 | 160 | 177 | 137 | 123 | 119 | 107 |
| Inactive | 40 | 45 | 47 | 62 | 64 | 70 | 86 | 79 | 90 | 91 |
| Unknown | 137 | 142 | 12 | 7 | 4 | 4 | - | - | - | - |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| Active | 7.8% | 7.0% | 70.8% | 70.9% | 70.2% | 70.5% | 61.4% | 60.9% | 56.9% | 54.0% |
| Inactive | 20.8% | 22.4% | 23.3% | 26.2% | 28.1% | 27.9% | 38.6% | 39.1% | 43.1% | 46.0% |
| Unknown | 71.4% | 70.6% | 5.9% | 3.0% | 1.8% | 1.6% | - | - | - | - |