| Similarity | Rank | |
|---|---|---|
| 1970 | 0.934 | 2583 |
| 1950 | 0.925 | 3691 |
| 1980 | 0.879 | 2404 |
| 1940 | 0.849 | 7398 |
| 1930 | 0.847 | 4100 |
| 1920 | 0.806 | 5459 |
| 1900 | 0.764 | 20137 |
| mid-1960s | 0.763 | 19473 |
| 1870 | 0.754 | 11182 |
| 1880 | 0.750 | 9812 |
| mid-1970 | 0.735 | 12406 |
| mid-1980 | 0.735 | 11219 |
| 1890 | 0.734 | 10843 |
| decade | 0.732 | 1661 |
| post-war | 0.732 | 4355 |
| mid-1960 | 0.731 | 49947 |
| mid-1950s | 0.727 | 24366 |
| nineteenth | 0.726 | 2686 |
| mid-to-late | 0.726 | 71501 |
| 1910 | 0.719 | 77774 |
| post-1945 | 0.705 | 34032 |
| mid-nineteenth | 0.704 | 18774 |
| twentieth | 0.697 | 3963 |
| 70 | 0.694 | 13033 |
| interwar | 0.690 | 19545 |