| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.12 | 6.11 | 2.89 |
| 2024 | 3.07 | 4.12 | 2.13 |
| 2023 | 5.3 | 8.55 | 3.5 |
| 2022 | 3.91 | 6.16 | 2.47 |
| 2021 | 7.13 | 13.71 | 3.86 |
| 2020 | 5.52 | 8.75 | 3.49 |
| 2019 | 3.13 | 4.23 | 2.23 |
| 2018 | 2.53 | 3.28 | 1.99 |
| 2017 | 4.26 | 5.02 | 2.87 |
| 2016 | 5.52 | 9.25 | 4.15 |
| 2015 | 4.79 | 10.32 | 2.57 |
| 2014 | 2.46 | 3.59 | 2.04 |
| 2013 | 2.37 | 2.97 | 1.77 |
| 2012 | 2.04 | 2.66 | 1.68 |
| 2011 | 2.67 | 3.35 | 1.78 |
| 2010 | 3.08 | 4.06 | 2.34 |
| 2009 | 2.28 | 3.29 | 1.59 |
| 2008 | 2.42 | 4.43 | 1.08 |
| 2007 | 3.02 | 4.57 | 1.56 |
| 2006 | 1.57 | 1.9 | 1.37 |
| 2005 | 1.87 | 2.47 | 1.43 |
| 2004 | 2.94 | 4.06 | 2.13 |
| 2003 | 3.47 | 7.8 | 2.54 |
| 2002 | 9.31 | 10.88 | 8.04 |
| 2001 | 11.38 | 13.51 | 9.63 |
| 2000 | 13.94 | 18.29 | 11.61 |
| 1999 | 7.52 | 10.88 | 5.45 |
| 1998 | 6.6 | 9.77 | 4.53 |
| 1997 | 5.3 | 8 | 2.93 |