| 1959 | 1982 | 1987 | 1992 | 1993 | 1994 | |
| Total revision | 3.5 | 25.7 | 42.3 | 86.1 | 78.4 | 88.9 |
| By source of revision | ||||||
| 3.5 | 25.7 | 42.3 | 86.1 | 78.4 | 88.9 | |
| 3.3 | 23.8 | 27.7 | 38.4 | 39.6 | 49.4 | |
| .2 | 1.9 | 14.6 | 47.7 | 38.8 | 39.5 | |
| By component | ||||||
| 1.7 | 10.3 | 27.6 | 65.7 | 58.0 | 60.5 | |
| 1.9 | 15.3 | 14.7 | 20.5 | 20.4 | 28.3 | |
| Addendum: | ||||||
| -1.4 | -8.5 | -13.0 | -17.9 | -19.2 | -21.1 | |