| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.38 | 1.88 | 1.09 |
| 2024 | 1.04 | 1.52 | 0.75 |
| 2023 | 1.17 | 1.43 | 1.03 |
| 2022 | 1.33 | 2 | 1.01 |
| 2021 | 1.65 | 3.1 | 1.22 |
| 2020 | 1.34 | 1.7 | 1.06 |
| 2019 | 1.89 | 2.46 | 1.4 |
| 2018 | 2.82 | 3.5 | 1.71 |
| 2017 | 4.14 | 8.04 | 2.67 |
| 2016 | 6.47 | 7.69 | 5.45 |
| 2015 | 9.7 | 17.89 | 5.62 |
| 2014 | 9.02 | 15.95 | 5.77 |
| 2013 | 7.11 | 8.69 | 5.3 |
| 2012 | 30.08 | 62.02 | 3.64 |
| 2011 | 31.91 | 39.5 | 22.51 |
| 2010 | 17.63 | 29.96 | 6.28 |
| 2009 | 5.31 | 8.96 | 2.33 |
| 2008 | 3.01 | 5.83 | 1.34 |
| 2007 | 3.96 | 7.09 | 1.6 |
| 2006 | 1.55 | 1.96 | 1.24 |
| 2005 | 1.49 | 2.27 | 0.92 |
| 2004 | 2.46 | 3.36 | 2.09 |