| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 6.06 | 9.65 | 3.74 |
| 2025 | 2.4 | 4.8 | 1.65 |
| 2024 | 0.92 | 2.8 | 0.19 |
| 2023 | 0.5 | 0.77 | 0.26 |
| 2022 | 0.59 | 0.83 | 0.33 |
| 2021 | 0.43 | 0.65 | 0.26 |
| 2020 | 0.59 | 0.82 | 0.37 |
| 2019 | 0.48 | 0.72 | 0.37 |
| 2018 | 0.56 | 0.74 | 0.42 |
| 2017 | 0.91 | 1.23 | 0.62 |
| 2016 | 0.93 | 1.38 | 0.66 |
| 2015 | 3.93 | 13.43 | 1.2 |
| 2014 | 4.63 | 9.56 | 2.04 |
| 2013 | 4.07 | 8.17 | 2.25 |
| 2012 | 3.76 | 6.25 | 1.31 |
| 2011 | 4.1 | 13.27 | 1.33 |
| 2010 | 9.35 | 14.73 | 5.8 |
| 2009 | 5.87 | 8.62 | 2.3 |
| 2008 | 4.17 | 8.14 | 1.48 |
| 2007 | 3.71 | 7.43 | 1.07 |
| 2006 | 0.98 | 1.48 | 0.56 |
| 2005 | 0.58 | 0.73 | 0.48 |
| 2004 | 0.65 | 0.87 | 0.47 |