Schedule
| Tax Year | Percentage |
|---|---|
| 1978/79 | 475.9 |
| 1979/80 | 408.3 |
| 1980/81 | 324.6 |
| 1981/82 | 255.6 |
| 1982/83 | 223.0 |
| 1983/84 | 199.9 |
| 1984/85 | 177.7 |
| 1985/86 | 160.5 |
| 1986/87 | 139.2 |
| 1987/88 | 122.7 |
| 1988/89 | 104.9 |
| 1989/90 | 84.9 |
| 1990/91 | 72.4 |
| 1991/92 | 56.5 |
| 1992/93 | 47.0 |
| 1993/94 | 40.0 |
| 1994/95 | 35.8 |
| 1995/96 | 30.1 |
| 1996/97 | 26.5 |
| 1997/98 | 20.5 |
| 1998/99 | 15.2 |
| 1999/2000 | 10.6 |
| 2000/2001 | 4.0 |