| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.43 | 2.92 | 2.08 |
| 2024 | 2.48 | 3.7 | 1.52 |
| 2023 | 3.26 | 4.09 | 2.18 |
| 2022 | 1.66 | 3.54 | 1.11 |
| 2021 | 2.25 | 3.11 | 1.43 |
| 2020 | 4.57 | 11.35 | 1.76 |
| 2019 | 2.82 | 4.43 | 2.02 |
| 2018 | 3.41 | 4.45 | 2.68 |
| 2017 | 3.68 | 4.5 | 2.84 |
| 2016 | 8.23 | 23.67 | 2.66 |
| 2015 | 14.32 | 27.01 | 4.87 |
| 2014 | 3.03 | 6.39 | 2.17 |
| 2013 | 2.4 | 3.19 | 1.72 |
| 2012 | 2.49 | 3.35 | 1.94 |
| 2011 | 3.78 | 5.01 | 2.38 |
| 2010 | 9.04 | 27.01 | 3.31 |
| 2009 | 11.08 | 31.58 | 1.66 |
| 2008 | 3.84 | 8.61 | 1.28 |
| 2007 | 3.22 | 7.76 | 1.02 |
| 2006 | 0.9 | 1.16 | 0.62 |
| 2005 | 0.89 | 1.15 | 0.74 |
| 2004 | 1.46 | 2.78 | 0.91 |