| 年份 | 预测值/mm | 预测状态 | 观测值/mm | 观测状态 | 相对误差/% |
| 2009 | 330.9 | 5 | 353.1 | 5 | −6.3 |
| 2010 | 341.2 | 5 | 282.4 | 3 | 20.8 |
| 2011 | 265.6 | 3 | 344.5 | 5 | −22.9 |
| 2012 | 315.7 | 4 | 286.9 | 3 | 10.0 |
| 2013 | 295.6 | 4 | 300.9 | 4 | −1.8 |
| 2014 | 320.2 | 4 | 297.0 | 4 | 7.8 |
| 2015 | 307.3 | 4 | 387.4 | 5 | −20.7 |
| 2016 | 323.5 | 5 | 387.1 | 5 | −16.4 |
| 2017 | 326.3 | 5 | 310.1 | 4 | 5.2 |
| 2018 | 346.1 | 5 | 335.1 | 5 | 3.3 |