| Years | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1950s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 2 | 6 |
| 1960s | 9 | 44 | 33 | 29 | 38 | 63 | 46 | 0 | 0 | 1 | 263 |
| 1970s | 0 | 0 | 0 | 0 | 40 | 29 | 22 | 0 | 114 | 26 | 231 |
| 1980s | 72 | 54 | 0 | 0 | 27 | 1 | 60 | 36 | 71 | 99 | 420 |
| 1990s | 93 | 101 | 92 | 80 | 104 | 116 | 84 | 93 | 110 | 119 | 992 |
| 2000s | 112 | 106 | 107 | 98 | 111 | 112 | 98 | 98 | 97 | 97 | 1036 |
| 2010s | 102 | 89 | 86 | 85 | 92 | 87 | 75 | 84 | 84 | 77 | 861 |
| 2020s | 0 | 21 | 82 | 75 | 78 | 57 | 0 | 0 | 0 | 0 | 313 |
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