| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.71 | 2.13 | 1.57 |
| 2024 | 1.67 | 2.13 | 1.39 |
| 2023 | 2.03 | 2.67 | 1.73 |
| 2022 | 1.78 | 2.41 | 1.41 |
| 2021 | 2.65 | 4.21 | 1.86 |
| 2020 | 13.25 | 60.35 | 3.44 |
| 2019 | 2.95 | 4.99 | 1.8 |
| 2018 | 2.39 | 3.51 | 1.65 |
| 2017 | 4.68 | 7.47 | 2.93 |
| 2016 | 5.1 | 6.98 | 3.5 |
| 2015 | 5.5 | 9.47 | 3.13 |
| 2014 | 2.89 | 3.91 | 2.32 |
| 2013 | 2.86 | 3.64 | 2.34 |
| 2012 | 3.33 | 5.12 | 2.61 |
| 2011 | 5.5 | 8.43 | 2.8 |
| 2010 | 5.25 | 10.47 | 3.45 |
| 2009 | 2.83 | 4.05 | 1.6 |
| 2008 | 2.64 | 5.01 | 1.22 |
| 2007 | 3.7 | 5.74 | 1.72 |
| 2006 | 1.62 | 2.33 | 1.16 |
| 2005 | 1.27 | 1.66 | 0.97 |
| 2004 | 2.01 | 2.7 | 1.49 |
| 2003 | 2.69 | 3.79 | 2.03 |
| 2002 | 3.97 | 5 | 2.57 |
| 2001 | 4.67 | 5.62 | 3.18 |
| 2000 | 5.07 | 6.25 | 4.35 |
| 1999 | 4.78 | 7.64 | 2.77 |
| 1998 | 4.13 | 5.34 | 3.01 |