| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.83 | 4.2 | 3.48 |
| 2024 | 4.06 | 5.53 | 2.58 |
| 2023 | 8.22 | 13.96 | 4.89 |
| 2022 | 13.12 | 20.34 | 8.68 |
| 2021 | 22.22 | 29.1 | 14.83 |
| 2020 | 9.07 | 19.94 | 3.66 |
| 2019 | 4.01 | 6.09 | 2.39 |
| 2018 | 3.52 | 4.71 | 2.26 |
| 2017 | 4.04 | 5.29 | 2.84 |
| 2016 | 3.47 | 4.7 | 2.36 |
| 2015 | 3.54 | 4.04 | 2.74 |
| 2014 | 2.32 | 2.99 | 1.85 |
| 2013 | 3.58 | 6.29 | 2.43 |
| 2012 | 9.04 | 12.69 | 4.85 |
| 2011 | 8.17 | 11.11 | 6.67 |
| 2010 | 7.24 | 10.4 | 4.64 |
| 2009 | 5.61 | 8.02 | 2.99 |
| 2008 | 6.71 | 17.77 | 2.1 |
| 2007 | 12.52 | 18.06 | 4.9 |
| 2006 | 2.46 | 4.9 | 0.88 |
| 2005 | 0.92 | 1.2 | 0.64 |
| 2004 | 1.38 | 1.75 | 0.96 |
| 2003 | 1.67 | 1.99 | 1.37 |
| 2002 | 2.25 | 2.49 | 1.78 |
| 2001 | 3.02 | 3.67 | 2.11 |
| 2000 | 3.51 | 3.87 | 3.09 |
| 1999 | 4.77 | 6.93 | 3.67 |
| 1998 | 7.39 | 9.56 | 5.57 |