| Patient Status | Year | |||||||||
| 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | |
| Total | 74 | 89 | 136 | 155 | 153 | 181 | 278 | 453 | 671 | 781 |
| Active | 2 | 2 | 87 | 116 | 118 | 149 | 239 | 345 | 465 | 489 |
| Inactive | 17 | 18 | 22 | 34 | 33 | 32 | 39 | 108 | 206 | 292 |
| Unknown | 55 | 69 | 27 | 5 | 2 | - | - | - | - | - |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| Active | 2.7% | 2.2% | 64.0% | 74.8% | 77.1% | 82.3% | 86.0% | 76.2% | 69.3% | 62.6% |
| Inactive | 23.0% | 20.2% | 16.2% | 21.9% | 21.6% | 17.7% | 14.0% | 23.8% | 30.7% | 37.4% |
| Unknown | 74.3% | 77.5% | 19.9% | 3.2% | 1.3% | - | - | - | - | - |