| Similarity | Rank | |
|---|---|---|
| 1960 | 0.934 | 2807 |
| 1980 | 0.921 | 2404 |
| 1950 | 0.875 | 3691 |
| 1930 | 0.806 | 4100 |
| 1920 | 0.779 | 5459 |
| decade | 0.777 | 1661 |
| mid-1980 | 0.776 | 11219 |
| mid-1960s | 0.775 | 19473 |
| mid-1970 | 0.772 | 12406 |
| 1940 | 0.770 | 7398 |
| 1900 | 0.769 | 20137 |
| mid-1950s | 0.740 | 24366 |
| mid-to-late | 0.739 | 71501 |
| 1870 | 0.717 | 11182 |
| mid-1960 | 0.715 | 49947 |
| 1880 | 0.715 | 9812 |
| 1890 | 0.709 | 10843 |
| politicisation | 0.708 | 49318 |
| urbanisation | 0.706 | 28493 |
| post-war | 0.705 | 4355 |
| nineteenth | 0.700 | 2686 |
| 1990 | 0.690 | 5663 |
| mid-1970s | 0.688 | 56155 |
| 1800 | 0.687 | 33369 |
| 1980s | 0.686 | 30850 |