| Similarity | Rank | |
|---|---|---|
| forty_year_ago | 0.827 | 84520 |
| fifty_year_ago | 0.779 | 58784 |
| ten_year_ago | 0.767 | 32649 |
| twenty_year_ago | 0.763 | 66247 |
| a_decade_ago | 0.752 | 23265 |
| [number]_year_ago | 0.717 | 3595 |
| two_decade_ago | 0.709 | 95707 |
| five_year_ago | 0.705 | 21349 |
| decade_ago | 0.700 | 32413 |
| in_the_1970 | 0.695 | 8581 |
| in_the_late_1970 | 0.688 | 36780 |
| in_the_1980 | 0.679 | 8174 |
| in_the_1960 | 0.678 | 9794 |
| Ten_year_ago_, | 0.671 | 77215 |
| in_the_1950 | 0.668 | 10960 |
| nearly_[number]_year_ago | 0.668 | 48159 |
| in_the_early_1970 | 0.665 | 30350 |
| more_than_[number]_year_ago | 0.665 | 24310 |
| in_the_early_1980 | 0.658 | 25476 |
| in_the_mid-1970 | 0.656 | 85270 |
| almost_[number]_year_ago | 0.654 | 51448 |
| eight_year_ago | 0.653 | 65575 |
| many_year_ago | 0.652 | 15620 |
| in_the_early_1960 | 0.647 | 41720 |
| just_a_few_year_ago | 0.646 | 72113 |