| Similarity | Rank | |
|---|---|---|
| thirty_year_ago | 0.827 | 57364 |
| fifty_year_ago | 0.782 | 58784 |
| twenty_year_ago | 0.730 | 66247 |
| [number]_year_ago | 0.672 | 3595 |
| ten_year_ago | 0.665 | 32649 |
| in_the_1960 | 0.657 | 9794 |
| a_decade_ago | 0.656 | 23265 |
| decade_ago | 0.656 | 32413 |
| a_century_ago | 0.645 | 46539 |
| in_the_1970 | 0.643 | 8581 |
| in_the_1950 | 0.636 | 10960 |
| two_decade_ago | 0.634 | 95707 |
| nearly_[number]_year_ago | 0.632 | 48159 |
| Ten_year_ago_, | 0.624 | 77215 |
| in_the_early_1970 | 0.622 | 30350 |
| in_the_mid-1970 | 0.620 | 85270 |
| in_the_early_1960 | 0.617 | 41720 |
| five_year_ago | 0.616 | 21349 |
| almost_[number]_year_ago | 0.612 | 51448 |
| in_the_late_1960 | 0.610 | 43535 |
| in_the_late_1970 | 0.609 | 36780 |
| over_[number]_year_ago | 0.608 | 22327 |
| back_then | 0.605 | 8288 |
| some_[number]_year_ago | 0.603 | 44893 |
| more_than_[number]_year_ago | 0.602 | 24310 |