Schedule
| Tax year | Percentage increase |
|---|---|
| 1978/79 | 354.4 |
| 1979/80 | 300.7 |
| 1980/81 | 235.0 |
| 1981/82 | 180.9 |
| 1982/83 | 154.9 |
| 1983/84 | 136.3 |
| 1984/85 | 118.7 |
| 1985/86 | 105.2 |
| 1986/87 | 88.5 |
| 1987/88 | 75.6 |
| 1988/89 | 61.4 |
| 1989/90 | 46.2 |
| 1990/91 | 36.3 |
| 1991/92 | 23.8 |
| 1992/93 | 16.3 |
| 1993/94 | 10.8 |
| 1994/95 | 7.4 |
| 1995/96 | 2.8 |