| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.07 | 2.79 | 1.35 |
| 2024 | 1.57 | 1.87 | 1.22 |
| 2023 | 2.54 | 3.2 | 1.83 |
| 2022 | 3.29 | 4.32 | 2.65 |
| 2021 | 4.82 | 6.26 | 3.82 |
| 2020 | 3.92 | 5.46 | 2.62 |
| 2019 | 3.47 | 4.08 | 3.04 |
| 2018 | 4.12 | 5.56 | 2.84 |
| 2017 | 3.85 | 4.57 | 3.16 |
| 2016 | 3.61 | 5.86 | 2.94 |
| 2015 | 6.77 | 8.76 | 5.04 |
| 2014 | 6.89 | 9.6 | 5.73 |
| 2013 | 10.58 | 13.36 | 8.38 |
| 2012 | 8.68 | 11.51 | 7.52 |
| 2011 | 9.89 | 11.01 | 8.02 |
| 2010 | 10.29 | 12.62 | 8.14 |
| 2009 | 6.76 | 8.63 | 5.66 |
| 2008 | 7.28 | 10.88 | 5.33 |
| 2007 | 7.78 | 10.44 | 3.95 |
| 2006 | 2.85 | 4.52 | 1.43 |
| 2005 | 1.27 | 1.53 | 0.98 |
| 2004 | 1.9 | 2.55 | 1.45 |
| 2003 | 2.51 | 3.11 | 2.09 |
| 2002 | 3.49 | 3.79 | 3.17 |