| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.19 | 0.22 | 0.16 |
| 2024 | 0.14 | 0.23 | 0.09 |
| 2023 | 0.14 | 0.27 | 0.07 |
| 2022 | 0.16 | 0.28 | 0.08 |
| 2021 | 0.36 | 0.57 | 0.21 |
| 2020 | 0.66 | 0.85 | 0.5 |
| 2019 | 0.78 | 1.06 | 0.59 |
| 2018 | 0.8 | 1.06 | 0.63 |
| 2017 | 0.99 | 1.2 | 0.83 |
| 2016 | 0.82 | 1.12 | 0.61 |
| 2015 | 1.56 | 2.71 | 0.95 |
| 2014 | 0.76 | 1.34 | 0.53 |
| 2013 | 1.18 | 1.66 | 0.7 |
| 2012 | 1.18 | 1.57 | 0.71 |
| 2011 | 761.19 | 5448.09 | 0.53 |
| 2010 | 3614.53 | 4537.68 | 2966.37 |
| 2009 | 5975.97 | 14028.6 | 256.21 |
| 2008 | 323.1 | 601.3 | 188.2 |
| 2007 | 165.79 | 298.88 | 43.39 |
| 2006 | 64.69 | 127.88 | 30.62 |
| 2005 | 46.3 | 114.97 | 2.86 |
| 2004 | 4.85 | 8.12 | 3.55 |