| Similarity | Rank | |
|---|---|---|
| 1970s | 0.978 | 7314 |
| 1950s | 0.977 | 9648 |
| 1960's | 0.966 | 19445 |
| mid-1960s | 0.957 | 63672 |
| 1940s | 0.951 | 16777 |
| 1980s | 0.949 | 7178 |
| 1970's | 0.948 | 18387 |
| mid-1950s | 0.939 | 83299 |
| mid-1970s | 0.931 | 53815 |
| 1950's | 0.926 | 20985 |
| 1930s | 0.924 | 11976 |
| 1980's | 0.922 | 18127 |
| 1920s | 0.912 | 14792 |
| 1990s | 0.898 | 7471 |
| 1940's | 0.898 | 33633 |
| '60s | 0.896 | 25607 |
| mid-1980s | 0.894 | 43287 |
| sixties | 0.891 | 21797 |
| seventies | 0.890 | 24080 |
| 1930's | 0.887 | 26347 |
| 1990's | 0.886 | 20839 |
| '70s | 0.881 | 23330 |
| 60s | 0.871 | 15489 |
| '40s | 0.871 | 67219 |
| '50s | 0.870 | 40055 |