| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.02 | 2.42 | 1.73 |
| 2024 | 1.43 | 2.13 | 1.02 |
| 2023 | 1.66 | 2.35 | 1.3 |
| 2022 | 2.23 | 3.23 | 1.59 |
| 2021 | 2.28 | 3.03 | 1.81 |
| 2020 | 2.68 | 3.09 | 2.3 |
| 2019 | 2.56 | 3.43 | 1.92 |
| 2018 | 2.71 | 4.15 | 1.8 |
| 2017 | 4.48 | 6.1 | 3.68 |
| 2016 | 4.28 | 5.47 | 2.77 |
| 2015 | 5 | 8.68 | 3.16 |
| 2014 | 4.01 | 4.96 | 3.21 |
| 2013 | 3.51 | 4.42 | 2.48 |
| 2012 | 2.89 | 3.87 | 2.1 |
| 2011 | 4.55 | 6.69 | 1.99 |
| 2010 | 4.48 | 7.48 | 3.03 |
| 2009 | 2.05 | 3.18 | 0.88 |
| 2008 | 2.01 | 4.18 | 0.69 |
| 2007 | 3.57 | 4.9 | 2.59 |
| 2006 | 2.87 | 4.04 | 2.11 |
| 2005 | 2.52 | 3.95 | 1.84 |
| 2004 | 3.22 | 6.28 | 2.29 |