Schedule
| Tax Year | Percentage |
|---|---|
| 1978/79 | 453.8 |
| 1979/80 | 388.7 |
| 1980/81 | 308.3 |
| 1981/82 | 242.0 |
| 1982/83 | 210.6 |
| 1983/84 | 188.4 |
| 1984/85 | 167.0 |
| 1985/86 | 150.5 |
| 1986/87 | 130.0 |
| 1987/88 | 114.2 |
| 1988/89 | 97.0 |
| 1989/90 | 77.8 |
| 1990/91 | 65.7 |
| 1991/92 | 50.5 |
| 1992/93 | 41.3 |
| 1993/94 | 34.6 |
| 1994/95 | 30.6 |
| 1995/96 | 25.1 |
| 1996/97 | 21.7 |
| 1997/98 | 15.9 |
| 1998/99 | 10.8 |
| 1999/2000 | 6.3 |