Schedule
| Tax Year | Percentage |
|---|---|
| 1978/79 | 419.5 |
| 1979/80 | 358.2 |
| 1980/81 | 283.0 |
| 1981/82 | 221.1 |
| 1982/83 | 191.4 |
| 1983/84 | 170.1 |
| 1984/85 | 150.1 |
| 1985/86 | 134.7 |
| 1986/87 | 115.6 |
| 1987/88 | 100.8 |
| 1988/89 | 84.6 |
| 1989/90 | 67.2 |
| 1990/91 | 55.8 |
| 1991/92 | 41.5 |
| 1992/93 | 33.0 |
| 1993/94 | 26.6 |
| 1994/95 | 22.8 |
| 1995/96 | 17.6 |
| 1996/97 | 14.1 |
| 1997/98 | 9.4 |
| 1998/99 | 4.2 |