Schedule
| Tax Year | Percentage Increase |
|---|---|
| 1978–79 | 522·3 |
| 1979–80 | 449·2 |
| 1980–81 | 358·8 |
| 1981–82 | 284·3 |
| 1982–83 | 249·0 |
| 1983–84 | 224·1 |
| 1984–85 | 200·1 |
| 1985–86 | 181·5 |
| 1986–87 | 158·5 |
| 1987–88 | 140·7 |
| 1988–89 | 121·4 |
| 1989–90 | 99·8 |
| 1990–91 | 86·2 |
| 1991–92 | 69·2 |
| 1992–93 | 58·8 |
| 1993–94 | 51·3 |
| 1994–95 | 46·7 |
| 1995–96 | 40·5 |
| 1996–97 | 36·7 |
| 1997–98 | 30·2 |
| 1998–99 | 24·5 |
| 1999–2000 | 19·5 |
| 2000–2001 | 12·4 |
| 2001–2002 | 8·1 |
| 2002–2003 | 3·6 |