| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.03 | 7.07 | 3.04 |
| 2024 | 3.04 | 4.41 | 2.17 |
| 2023 | 3.45 | 5.22 | 2.33 |
| 2022 | 1.94 | 2.65 | 1.54 |
| 2021 | 1.63 | 1.89 | 1.46 |
| 2020 | 2.15 | 2.79 | 1.64 |
| 2019 | 2.33 | 3.45 | 1.46 |
| 2018 | 1.98 | 2.62 | 1.42 |
| 2017 | 2.54 | 3.06 | 2.13 |
| 2016 | 5.02 | 14.15 | 2.45 |
| 2015 | 9.12 | 14.49 | 6.24 |
| 2014 | 6.71 | 8 | 4.81 |
| 2013 | 3.95 | 6.05 | 2.81 |
| 2012 | 5.55 | 11.46 | 2.53 |
| 2011 | 15.38 | 23.92 | 9.25 |
| 2010 | 19.14 | 27.78 | 14.25 |
| 2009 | 9.21 | 18.49 | 3.32 |
| 2008 | 3.98 | 6.44 | 1.93 |
| 2007 | 4.31 | 7.82 | 1.89 |
| 2006 | 1.32 | 2.07 | 0.81 |
| 2005 | 0.74 | 1.06 | 0.46 |
| 2004 | 1.03 | 1.65 | 0.64 |