Standardised mortality ratios for all causes of death
| Year | Standardised mortality ratio (95% CI) |
| 1991 | 0.5 (0.01 to 3.0) |
| 1992 | 1.4 (0.6 to 2.8) |
| 1993 | 1.0 (0.5 to 1.8) |
| 1994 | 0.5 (0.3 to 0.9) |
| 1995 | 0.7 (0.5 to 1.1) |
| 1996 | 0.7 (0.5 to 1.0) |
| 1997 | 0.8 (0.6 to 1.1) |
| 1998 | 1.1 (0.9 to 1.4) |
| 1999 | 1.0 (0.8 to 1.2) |
| 2000 | 1.2 (0.9 to 1.4) |
| 2001 | 1.2 (0.9 to 1.4) |
| 2002 | 1.4 (1.1 to 1.7) |
| 2003 | 1.8 (1.1 to 2.9) |