| 2010 | 2015 | 2020 | |
|---|---|---|---|
| Hokkaido | 70.8 | 70.6 | 70.2 |
| Aomori | 65.1 | 65.1 | 64.9 |
| Iwate | 75.8 | 75.7 | 75.4 |
| Miyagi | 56.6 | 56.4 | 56.0 |
| Akita | 71.9 | 71.8 | 71.5 |
| Yamagata | 69.4 | 69.1 | 69.2 |
| Fukushima | 68.4 | 68.5 | 68.4 |
| Ibaraki | 31.0 | 31.2 | 32.6 |
| Tochigi | 53.3 | 53.3 | 52.9 |
| Gunma | 63.8 | 64.1 | 64.3 |
| Saitama | 32.2 | 31.9 | 31.5 |
| Chiba | 31.2 | 30.8 | 31.2 |
| Tokyo | 36.4 | 35.3 | 35.2 |
| Kanagawa | 39.0 | 38.8 | 38.7 |
| Niigata | 64.2 | 63.9 | 63.8 |
| Toyama | 56.4 | 56.6 | 56.6 |
| Ishikawa | 66.7 | 66.6 | 66.5 |
| Fukui | 74.1 | 74.0 | 74.0 |
| Yamanashi | 78.2 | 78.2 | 78.2 |
| Nagano | 75.4 | 76.1 | 75.9 |
| Gifu | 79.3 | 79.2 | 79.2 |
| Shizuoka | 63.7 | 63.7 | 63.4 |
| Aichi | 42.4 | 42.2 | 42.1 |
| Mie | 64.6 | 64.3 | 64.3 |
| Shiga | 50.9 | 50.7 | 50.9 |
| Kyoto | 74.2 | 74.3 | 74.2 |
| Osaka | 30.6 | 30.2 | 30.0 |
| Hyogo | 66.9 | 66.9 | 67.0 |
| Nara | 76.9 | 76.8 | 76.9 |
| Wakayama | 76.8 | 76.4 | 76.2 |
| Tottori | 73.5 | 73.8 | 73.7 |
| Shimane | 78.4 | 78.3 | 78.7 |
| Okayama | 68.7 | 68.8 | 68.7 |
| Hiroshima | 73.0 | 72.7 | 72.9 |
| Yamaguchi | 71.9 | 72.1 | 71.9 |
| Tokushima | 75.3 | 75.6 | 75.5 |
| Kagawa | 46.6 | 46.4 | 46.5 |
| Ehime | 70.6 | 70.5 | 70.6 |
| Kochi | 83.7 | 83.6 | 83.7 |
| Fukuoka | 44.3 | 44.6 | 44.6 |
| Saga | 45.4 | 45.3 | 45.3 |
| Nagasaki | 60.2 | 59.4 | 59.6 |
| Kumamoto | 63.1 | 62.3 | 62.9 |
| Oita | 72.5 | 71.6 | 71.7 |
| Miyazaki | 76.2 | 76.1 | 75.7 |
| Kagoshima | 64.3 | 63.8 | 64.1 |
| Okinawa | 48.7 | 48.7 | 50.7 |