| Career Disposition as Lifers | N | Men | Women | Lifers | % | Men | % | Women | Women% | ||||||
| 1889-1914 | 61 | 44 | 17 | 41 | 67% | 25 | 57% | 16 | 94% | ||||||
| 1915-1939 | 65 | 27 | 38 | 39 | 60% | 11 | 41% | 26 | 68% | ||||||
| 1940-1964 | 104 | 50 | 54 | 62 | 60% | 27 | 54% | 35 | 65% | ||||||
| 1965-1989 | 249 | 115 | 134 | 90 | 36% | 40 | 35% | 50 | 37% | ||||||
| 1990-2018 | 359 | 126 | 233 | ||||||||||||