| Previous LI Tx | Year | |||||||||
| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | |
| Total | 12,237 | 14,451 | 16,576 | 18,665 | 20,985 | 23,307 | 25,648 | 27,851 | 28,985 | 33,854 |
| No | 11,159 | 13,226 | 15,182 | 17,106 | 19,287 | 21,486 | 23,707 | 25,763 | 26,866 | 31,426 |
| Yes | 1,078 | 1,225 | 1,394 | 1,559 | 1,698 | 1,821 | 1,941 | 2,088 | 2,119 | 2,428 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| No | 91.2% | 91.5% | 91.6% | 91.6% | 91.9% | 92.2% | 92.4% | 92.5% | 92.7% | 92.8% |
| Yes | 8.8% | 8.5% | 8.4% | 8.4% | 8.1% | 7.8% | 7.6% | 7.5% | 7.3% | 7.2% |