| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.93 | 5.14 | 3.58 |
| 2024 | 3.13 | 4.65 | 1.49 |
| 2023 | 1.95 | 2.27 | 1.6 |
| 2022 | 2.94 | 6.25 | 1.68 |
| 2021 | 4.59 | 6.9 | 3.26 |
| 2020 | 4.1 | 5.23 | 3.53 |
| 2019 | 6.1 | 10.96 | 4.19 |
| 2018 | 9.18 | 13.3 | 6.46 |
| 2017 | 13.24 | 14.77 | 12.05 |
| 2016 | 14.42 | 18.96 | 10.26 |
| 2015 | 13.13 | 19.03 | 6.74 |
| 2014 | 7.57 | 11.13 | 5.92 |
| 2013 | 7.35 | 12.94 | 5.39 |
| 2012 | 3.63 | 6.04 | 2.44 |
| 2011 | 6.12 | 12.19 | 2.56 |
| 2010 | 11.16 | 14.26 | 9.15 |
| 2009 | 10.8 | 15.36 | 6.44 |
| 2008 | 12.55 | 26.01 | 4.63 |
| 2007 | 19.9 | 30.22 | 9.76 |
| 2006 | 6.77 | 10.74 | 4.89 |
| 2005 | 4.31 | 6.13 | 2.85 |
| 2004 | 5.07 | 8.26 | 3.2 |