| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.36 | 0.4 | 0.32 |
| 2024 | 0.39 | 0.63 | 0.19 |
| 2023 | 0.43 | 0.78 | 0.26 |
| 2022 | 1.02 | 2.55 | 0.6 |
| 2021 | 3.55 | 6.35 | 1.18 |
| 2020 | 2.22 | 4.7 | 1.08 |
| 2019 | 2.07 | 3.06 | 1.16 |
| 2018 | 2.66 | 4.81 | 1.43 |
| 2017 | 5.44 | 9.98 | 3.78 |
| 2016 | 3.75 | 4.79 | 2.47 |
| 2015 | 2.53 | 4.81 | 1.22 |
| 2014 | 1.48 | 2.38 | 1.13 |
| 2013 | 2.09 | 2.74 | 1.31 |
| 2012 | 1.18 | 1.41 | 1.02 |
| 2011 | 5.1 | 14.44 | 1.06 |
| 2010 | 20.14 | 53.67 | 10.93 |
| 2009 | 15.15 | 63.72 | 1.41 |
| 2008 | 2.72 | 7.94 | 1.03 |
| 2007 | 6.44 | 12.45 | 1.99 |
| 2006 | 2.24 | 3.56 | 1.63 |
| 2005 | 2.6 | 3.45 | 1.62 |
| 2004 | 2.85 | 4.45 | 1.61 |