| Similarity | Rank | |
|---|---|---|
| forty_year_ago | 0.782 | 84520 |
| thirty_year_ago | 0.779 | 57364 |
| twenty_year_ago | 0.687 | 66247 |
| [number]_year_ago | 0.678 | 3595 |
| a_century_ago | 0.654 | 46539 |
| ten_year_ago | 0.631 | 32649 |
| Ten_year_ago_, | 0.611 | 77215 |
| decade_ago | 0.603 | 32413 |
| [number]_year_since | 0.599 | 40318 |
| almost_[number]_year_ago | 0.597 | 51448 |
| in_the_1960 | 0.596 | 9794 |
| [number]_year_later | 0.593 | 15406 |
| nearly_[number]_year_ago | 0.591 | 48159 |
| more_than_[number]_year_ago | 0.590 | 24310 |
| in_the_1950 | 0.588 | 10960 |
| in_the_early_1960 | 0.582 | 41720 |
| a_decade_ago | 0.572 | 23265 |
| in_the_last_century | 0.572 | 65606 |
| a_decade_later | 0.570 | 64448 |
| some_[number]_year_ago | 0.570 | 44893 |
| [number]_year_earlier | 0.569 | 77234 |
| back_then | 0.563 | 8288 |
| two_decade_ago | 0.561 | 95707 |
| over_[number]_year_ago | 0.555 | 22327 |
| in_the_early_1900 | 0.554 | 43562 |