| Previous LI Tx | Year | |||||||||
| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | |
| Total | 3,955 | 5,526 | 7,261 | 9,297 | 11,562 | 13,958 | 16,133 | 17,953 | 16,790 | 17,171 |
| No | 3,662 | 5,162 | 6,831 | 8,767 | 10,906 | 13,250 | 15,188 | 16,703 | 15,617 | 15,965 |
| Yes | 293 | 364 | 430 | 530 | 656 | 708 | 945 | 1,250 | 1,173 | 1,206 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| No | 92.6% | 93.4% | 94.1% | 94.3% | 94.3% | 94.9% | 94.1% | 93.0% | 93.0% | 93.0% |
| Yes | 7.4% | 6.6% | 5.9% | 5.7% | 5.7% | 5.1% | 5.9% | 7.0% | 7.0% | 7.0% |