| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.78 | 4.56 | 3.18 |
| 2024 | 2.53 | 5.61 | 1.84 |
| 2023 | 3.08 | 3.76 | 2.7 |
| 2022 | 3.63 | 4.64 | 2.93 |
| 2021 | 3.51 | 4.38 | 2.86 |
| 2020 | 3.81 | 4.78 | 3.21 |
| 2019 | 2.87 | 4.08 | 1.88 |
| 2018 | 2.61 | 3.75 | 1.73 |
| 2017 | 3.01 | 4.07 | 2.43 |
| 2016 | 3.34 | 4.38 | 2.63 |
| 2015 | 4.62 | 7.89 | 3.16 |
| 2014 | 4.77 | 8.31 | 3.19 |
| 2013 | 4.42 | 7.85 | 2.99 |
| 2012 | 3.01 | 3.67 | 2.3 |
| 2011 | 4.32 | 5.9 | 2.73 |
| 2010 | 4.07 | 5.68 | 2.99 |
| 2009 | 3.07 | 3.89 | 1.85 |
| 2008 | 2.85 | 5.43 | 1.49 |
| 2007 | 5.09 | 7.42 | 2.58 |
| 2006 | 1.67 | 2.46 | 1.02 |
| 2005 | 1.1 | 1.6 | 0.77 |
| 2004 | 2.21 | 3.28 | 1.46 |
| 2003 | 2.92 | 3.54 | 2.37 |
| 2002 | 3.62 | 4.14 | 2.71 |
| 2001 | 5.25 | 6.48 | 3.52 |
| 2000 | 6.22 | 7.68 | 5.17 |