| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.57 | 4.27 | 2.9 |
| 2024 | 2.68 | 4.93 | 1.63 |
| 2023 | 5.35 | 8.99 | 2.67 |
| 2022 | 8.79 | 15.66 | 4.23 |
| 2021 | 6.05 | 10.27 | 3.7 |
| 2020 | 9.22 | 14.3 | 5.42 |
| 2019 | 8.43 | 31.92 | 4.71 |
| 2018 | 5.3 | 7.64 | 3.48 |
| 2017 | 7.33 | 8.87 | 6.55 |
| 2016 | 7.15 | 9.46 | 5.06 |
| 2015 | 7.58 | 12.61 | 5.84 |
| 2014 | 5.16 | 7.06 | 3.73 |
| 2013 | 4.13 | 5.85 | 3.06 |
| 2012 | 2.83 | 3.8 | 1.83 |
| 2011 | 3.3 | 4.44 | 1.92 |
| 2010 | 4.08 | 5.3 | 3.04 |
| 2009 | 4.07 | 4.88 | 2.82 |
| 2008 | 4.23 | 7.84 | 1.81 |
| 2007 | 5 | 7.75 | 2.19 |
| 2006 | 2.12 | 2.88 | 1.68 |
| 2005 | 2.49 | 3.41 | 1.59 |
| 2004 | 3.96 | 6.16 | 2.44 |
| 2003 | 5.59 | 6.84 | 3.97 |
| 2002 | 7.85 | 9.69 | 4.99 |
| 2001 | 9.36 | 11.85 | 6.55 |
| 2000 | 7.76 | 12.37 | 3.73 |
| 1999 | 3.41 | 4.61 | 2.5 |
| 1998 | 3.62 | 4.3 | 2.84 |
| 1997 | 4.34 | 6.61 | 3.22 |