Schedule
| Tax Year | Percentage Increase |
|---|---|
| 1978–79 | 545·9 |
| 1979–80 | 470·1 |
| 1980–81 | 376·3 |
| 1981–82 | 298·9 |
| 1982–83 | 262·3 |
| 1983–84 | 236·4 |
| 1984–85 | 211·5 |
| 1985–86 | 192·2 |
| 1986–87 | 168·3 |
| 1987–88 | 149·8 |
| 1988–89 | 129·8 |
| 1989–90 | 107·4 |
| 1990–91 | 93·3 |
| 1991–92 | 75·6 |
| 1992–93 | 64·9 |
| 1993–94 | 57·0 |
| 1994–95 | 52·3 |
| 1995–96 | 45·9 |
| 1996–97 | 41·9 |
| 1997–98 | 35·1 |
| 1998–99 | 29·2 |
| 1999–2000 | 24·0 |
| 2000–2001 | 16·6 |
| 2001–2002 | 12·2 |
| 2002–2003 | 7·5 |
| 2003–2004 | 3·8 |