| 年份 | I级 | II级 | III级 | IV级 | V级 | 评价结果 |
| 2011 | 0.197 | 0.186 | 0.551 | 0.067 | 0.000 | III |
| 2012 | 0.312 | 0.051 | 0.000 | 0.417 | 0.220 | IV |
| 2013 | 0.259 | 0.026 | 0.000 | 0.000 | 0.698 | V |
| 2014 | 0.259 | 0.052 | 0.000 | 0.000 | 0.654 | V |
| 2015 | 0.260 | 0.048 | 0.000 | 0.000 | 0.665 | V |
| 2016 | 0.242 | 0.007 | 0.690 | 0.060 | 0.000 | III |