| Previous PA/KP Tx | Year | |||||||||
| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | |
| Total | 89 | 136 | 155 | 153 | 182 | 280 | 456 | 674 | 784 | 925 |
| No | 54 | 82 | 93 | 94 | 101 | 179 | 319 | 502 | 601 | 710 |
| Yes | 35 | 54 | 62 | 59 | 81 | 101 | 137 | 172 | 183 | 215 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| No | 60.7% | 60.3% | 60.0% | 61.4% | 55.5% | 63.9% | 70.0% | 74.5% | 76.7% | 76.8% |
| Yes | 39.3% | 39.7% | 40.0% | 38.6% | 44.5% | 36.1% | 30.0% | 25.5% | 23.3% | 23.2% |