| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.32 | 5.29 | 3.57 |
| 2024 | 3.15 | 4.44 | 2.38 |
| 2023 | 3.2 | 5.48 | 2.06 |
| 2022 | 2.39 | 3.41 | 1.73 |
| 2021 | 2.99 | 3.58 | 2.58 |
| 2020 | 4.74 | 6.62 | 2.59 |
| 2019 | 3.59 | 4.92 | 2.62 |
| 2018 | 3.81 | 5.08 | 2.68 |
| 2017 | 4.72 | 6.47 | 3.22 |
| 2016 | 6.73 | 10.43 | 4.99 |
| 2015 | 11.79 | 19.59 | 6.67 |
| 2014 | 9.1 | 12.93 | 5.26 |
| 2013 | 6.4 | 12.18 | 2.71 |
| 2012 | 2.86 | 3.64 | 2.19 |
| 2011 | 4.12 | 5.53 | 2.89 |
| 2010 | 3.35 | 6.04 | 2.14 |
| 2009 | 1.83 | 2.31 | 1.12 |
| 2008 | 1.59 | 2.62 | 0.84 |
| 2007 | 1.98 | 2.96 | 1.21 |
| 2006 | 1.36 | 1.7 | 1.12 |
| 2005 | 1.63 | 2.24 | 1.2 |
| 2004 | 2.62 | 5.76 | 1.77 |
| 2003 | 4.44 | 5.47 | 3.26 |
| 2002 | 4.78 | 5.8 | 4.09 |
| 2001 | 7.61 | 9.81 | 5.13 |