Schedule
| Tax Year | Percentage |
|---|---|
| 1978/79 | 377.0 |
| 1979/80 | 320.7 |
| 1980/81 | 251.6 |
| 1981/82 | 194.8 |
| 1982/83 | 167.6 |
| 1983/84 | 148.0 |
| 1984/85 | 129.6 |
| 1985/86 | 115.5 |
| 1986/87 | 97.9 |
| 1987/88 | 84.4 |
| 1988/89 | 69.5 |
| 1989/90 | 53.5 |
| 1990/91 | 43.1 |
| 1991/92 | 30.0 |
| 1992/93 | 22.1 |
| 1993/94 | 16.3 |
| 1994/95 | 12.7 |
| 1995/96 | 8.0 |
| 1996/97 | 5.0 |