Schedule
| Tax Year | Percentage |
|---|---|
| 1978-79 | 623.8 |
| 1979-80 | 538.8 |
| 1980-81 | 433.7 |
| 1981-82 | 347.0 |
| 1982-83 | 306.0 |
| 1983-84 | 276.9 |
| 1984-85 | 249.0 |
| 1985-86 | 227.4 |
| 1986-87 | 200.7 |
| 1987-88 | 179.9 |
| 1988-89 | 157.5 |
| 1989-90 | 132.4 |
| 1990-91 | 116.6 |
| 1991-92 | 96.7 |
| 1992-93 | 84.7 |
| 1993-94 | 75.9 |
| 1994-95 | 70.7 |
| 1995-96 | 63.5 |
| 1996-97 | 59.0 |
| 1997-98 | 51.4 |
| 1998-99 | 44.8 |
| 1999-2000 | 38.9 |
| 2000-2001 | 30.7 |
| 2001-2002 | 25.7 |
| 2002-2003 | 20.5 |
| 2003-2004 | 16.3 |
| 2004-2005 | 12.1 |
| 2005-2006 | 7.6 |
| 2006-2007 | 4.1 |