| 年份 | 不透水层面积(m2) | 不透水率 |
| 2013 | 774,394,200 | 11.75% |
| 2014 | 866,862,000 | 14.03% |
| 2016 | 1,307,335,500 | 19.84% |
| 2017 | 1,464,299,100 | 22.21% |
| 2018 | 1,769,500,800 | 26.85% |