| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.91 | 3.19 | 2.5 |
| 2023 | 4.21 | 6.43 | 2.73 |
| 2022 | 12.55 | 21.9 | 5.3 |
| 2021 | 26.17 | 48.32 | 15.55 |
| 2020 | 2.01 | 3.38 | 1.34 |
| 2019 | 1.18 | 1.68 | 0.87 |
| 2018 | 1.43 | 1.98 | 0.99 |
| 2017 | 1.44 | 2.34 | 1.07 |
| 2016 | 1.65 | 2.37 | 1.39 |
| 2015 | 2.21 | 3.06 | 1.47 |
| 2014 | 1.63 | 2.23 | 1.37 |
| 2013 | 2.13 | 3.03 | 1.59 |
| 2012 | 3.53 | 4.65 | 2.33 |
| 2011 | 8.66 | 24.21 | 3.61 |
| 2010 | 12.5 | 17.82 | 8.57 |
| 2009 | 14.54 | 18.96 | 10.56 |
| 2008 | 29.29 | 36.26 | 16.96 |
| 2007 | 16.31 | 29.55 | 9.46 |
| 2006 | 8.29 | 10.4 | 5.75 |
| 2005 | 5.73 | 6.79 | 4.48 |
| 2004 | 4.94 | 5.77 | 4.14 |
| 2003 | 4.01 | 7.17 | 3.47 |
| 2002 | 5.06 | 5.52 | 4.52 |
| 2001 | 5.6 | 6.71 | 4.18 |
| 2000 | 5.97 | 7.36 | 4.07 |
| 1999 | 5.26 | 6.57 | 4.13 |
| 1998 | 4.89 | 6.29 | 3.57 |