| Region | 2012 | 2013 | 2014 | 2015 |
| Beijing | 2.25% | 2.02% | 1.74% | 1.86% |
| Tianjin | 3.27% | 3.03% | 2.20% | 2.49% |
| Hebei | 4.12% | 3.80% | 3.42% | 3.81% |
| Liaoning | 3.00% | 2.63% | 2.46% | 2.07% |
| Shanghai | 1.76% | 1.55% | 1.85% | 1.49% |
| Jiangsu | 2.73% | 2.65% | 2.43% | 2.17% |
| Zhejiang | 2.85% | 2.97% | 2.76% | 2.73% |
| Fujian | 2.78% | 2.67% | 2.59% | 5.39% |
| Shandong | 3.11% | 3.18% | 3.04% | 2.57% |
| Guangdong | 2.62% | 2.35% | 1.91% | 1.99% |
| Hainan | 3.09% | 3.15% | 2.81% | 3.29% |