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| 1920 | 16.4 | 12.3 |
| 1940 | 42.9 | 10.5 |
| 1960 | 44.0 | 18.8 |
| 1980 | 64.2 | 19.3 |
| 2000 | 71.6 | 45.0 |
| 2020 | 73.4 | 53.5 |
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