| 序号 | 时间 (年) |
数据 (人/户) |
|---|---|---|
| 1 | 2022 | |
| 2 | 2021 | |
| 3 | 2020 | |
| 4 | 2019 | |
| 5 | 2018 | |
| 6 | 2017 | |
| 7 | 2016 | 3.56 |
| 8 | 2015 | 3.43 |
| 9 | 2014 | 3.80 |
| 10 | 2010 | 4.13 |
| 11 | 2005 | 4.15 |
| 12 | 2000 | 4.42 |
| 13 | 1995 | 4.67 |
| 14 | 1990 | 5.17 |
| 15 | 1985 | 5.84 |
| 16 | 1980 | 5.56 |
