| Year | Previously published | Revised | Revision | Year | Previously published | Revised | Revision |
| 1982 | 9.1 | 9.0 | -0.1 | 1990 | 5.3 | 5.1 | -.2 |
| 1983 | 7.0 | 6.7 | -.3 | 1991 | 6.0 | 5.6 | -.4 |
| 1984 | 8.7 | 8.6 | -.1 | 1992 | 6.2 | 5.7 | -.5 |
| 1985 | 7.2 | 6.9 | -.3 | 1993 | 5.1 | 4.4 | -.7 |
| 1986 | 6.5 | 5.9 | -.6 | 1994 | 4.2 | 3.5 | -.7 |
| 1987 | 5.3 | 5.0 | -.3 | 1995 | 4.8 | 3.4 | -1.4 |
| 1988 | 5.5 | 5.4 | -.1 | 1996 | 4.3 | 2.9 | -1.4 |
| 1989 | 5.1 | 5.0 | -.1 | 1997 | 3.9 | 2.1 | -1.8 |
