Trends in defence arguments over time
| Defence argument | Time period* | ||
|---|---|---|---|
| 1996 and earlier (9 cases) | 1997–2002 (21 cases) | 2003 (4 cases) | |
| *Number of cases shown in parentheses. | |||
| No causality | 89% (8) | 65% (13) | 25% (1) |
| Other risk factors | 11% (1) | 33% (9) | 50% (2) |
| Free will | 56% (5) | 71% (15) | 100% (4) |