| Previously published | Revised | Revision | |
| Contractions | |||
| 1960:I-1960:IV | 0.3 | ||
| 1969:III-1970:IV | 0 | ||
| 1973:IV-1975:I | .6 | ||
| 1980:I-1980:III | .7 | ||
| 1981:I-1982:III | .3 | ||
| 1990:II-1991:I | .9 | ||
| Expansions | |||
| 1960:IV-1969:III | 5.1 | 5.1 | 0 |
| 1970:IV-1973:IV | 5.2 | 5.1 | |
| 1975:I-1980:I | 4.2 | 4.4 | .2 |
| 1980:III-1981:I | 7.9 | 7.6 | |
| 1982:III-1990:II | 3.8 | 4.1 | .3 |
| 1991:I-1999:II/1/ | 3.1 | 3.5 | .4 |
1. The current expansion is shown through the second quarter of 1999.