| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.58 | 2.76 | 2.41 |
| 2024 | 2.29 | 2.85 | 1.86 |
| 2023 | 2.64 | 3.56 | 2.15 |
| 2022 | 3.25 | 4.36 | 2.2 |
| 2021 | 3.94 | 5.76 | 2.94 |
| 2020 | 2.64 | 3.43 | 2.09 |
| 2019 | 2.66 | 3.17 | 2.32 |
| 2018 | 3.23 | 4.29 | 2.36 |
| 2017 | 4.08 | 5.85 | 3.11 |
| 2016 | 3.83 | 5.12 | 1.92 |
| 2015 | 4.09 | 7.79 | 2.08 |
| 2014 | 4.56 | 6.76 | 3.59 |
| 2013 | 5.63 | 7.61 | 4.1 |
| 2012 | 7.69 | 9.8 | 5.12 |
| 2011 | 10.56 | 14.11 | 5.81 |
| 2010 | 8.04 | 17.04 | 4.8 |
| 2009 | 5.88 | 8.1 | 2.89 |
| 2008 | 4.47 | 9.36 | 2.65 |
| 2007 | 8.81 | 12.97 | 4.88 |
| 2006 | 7.11 | 10.52 | 4.53 |
| 2005 | 3.54 | 4.16 | 2.53 |
| 2004 | 3.59 | 4.68 | 1.76 |
| 2003 | 5.8 | 12.26 | 3.37 |