Schedule
| Tax Year | Percentage |
|---|---|
| 1978-79 | 595.3 |
| 1979-80 | 513.7 |
| 1980-81 | 412.7 |
| 1981-82 | 329.4 |
| 1982-83 | 290.0 |
| 1983-84 | 262.1 |
| 1984-85 | 235.3 |
| 1985-86 | 214.5 |
| 1986-87 | 188.8 |
| 1987-88 | 168.9 |
| 1988-89 | 147.4 |
| 1989-90 | 123.3 |
| 1990-91 | 108.1 |
| 1991-92 | 89.0 |
| 1992-93 | 77.5 |
| 1993-94 | 69.0 |
| 1994-95 | 63.9 |
| 1995-96 | 57.0 |
| 1996-97 | 52.7 |
| 1997-98 | 45.5 |
| 1998-99 | 39.1 |
| 1999-2000 | 33.5 |
| 2000-2001 | 25.6 |
| 2001-2002 | 20.7 |
| 2002-2003 | 15.8 |
| 2003-2004 | 11.7 |
| 2004-2005 | 7.6 |
| 2005-2006 | 3.4 |