| Previous LI Tx | Year | |||||||||
| 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | |
| Total | 10,141 | 12,216 | 14,427 | 16,536 | 18,614 | 20,915 | 23,162 | 25,376 | 26,692 | 31,195 |
| No | 9,030 | 11,013 | 13,094 | 15,051 | 16,976 | 19,142 | 21,280 | 23,397 | 24,645 | 28,836 |
| Yes | 1,111 | 1,203 | 1,333 | 1,485 | 1,638 | 1,773 | 1,882 | 1,979 | 2,047 | 2,359 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| No | 89.0% | 90.2% | 90.8% | 91.0% | 91.2% | 91.5% | 91.9% | 92.2% | 92.3% | 92.4% |
| Yes | 11.0% | 9.8% | 9.2% | 9.0% | 8.8% | 8.5% | 8.1% | 7.8% | 7.7% | 7.6% |