Schedule
| Tax Year | Percentage |
|---|---|
| 1978/79 | 399.0 |
| 1979/80 | 340.0 |
| 1980/81 | 267.8 |
| 1981/82 | 208.4 |
| 1982/83 | 179.9 |
| 1983/84 | 159.4 |
| 1984/85 | 140.2 |
| 1985/86 | 125.4 |
| 1986/87 | 107.0 |
| 1987/88 | 92.9 |
| 1988/89 | 77.3 |
| 1989/90 | 60.6 |
| 1990/91 | 49.7 |
| 1991/92 | 35.9 |
| 1992/93 | 27.7 |
| 1993/94 | 21.6 |
| 1994/95 | 17.9 |
| 1995/96 | 12.9 |
| 1996/97 | 9.8 |
| 1997/98 | 4.6 |