| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.34 | 4.94 | 3.65 |
| 2024 | 3.6 | 5.82 | 2.78 |
| 2023 | 3.97 | 5.17 | 3.5 |
| 2022 | 4.67 | 7.01 | 3.19 |
| 2021 | 6.01 | 9.11 | 3.27 |
| 2020 | 2.23 | 3.87 | 0.89 |
| 2019 | 1.09 | 1.74 | 0.72 |
| 2018 | 0.87 | 1.16 | 0.57 |
| 2017 | 1.25 | 1.44 | 1.01 |
| 2016 | 1.44 | 1.88 | 1.22 |
| 2015 | 16.98 | 73.75 | 1.48 |
| 2014 | 6.23 | 9.53 | 4.1 |
| 2013 | 3.83 | 4.77 | 3.13 |
| 2012 | 3.88 | 5.68 | 2.84 |
| 2011 | 7.79 | 10.51 | 4 |
| 2010 | 6.86 | 9.91 | 4.73 |
| 2009 | 4.83 | 7.87 | 2.41 |
| 2008 | 3.55 | 6.34 | 1.62 |
| 2007 | 2.63 | 4.15 | 1.17 |
| 2006 | 1.23 | 1.6 | 0.83 |
| 2005 | 1.05 | 1.57 | 0.7 |
| 2004 | 2.02 | 2.71 | 1.43 |
| 2003 | 2.12 | 3.23 | 1.49 |
| 2002 | 3.3 | 3.68 | 2.44 |
| 2001 | 4.77 | 6.55 | 2.96 |
| 2000 | 4.96 | 6.56 | 3.04 |
| 1999 | 4.44 | 6.2 | 3.37 |
| 1998 | 5.21 | 5.99 | 4.13 |