| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.66 | 5.22 | 1.82 |
| 2024 | 2.32 | 3.09 | 1.69 |
| 2023 | 3.28 | 4.45 | 2.34 |
| 2022 | 5.06 | 7.76 | 3.72 |
| 2021 | 1.32 | 1.55 | 1.08 |
| 2020 | 1.79 | 2.33 | 1.47 |
| 2019 | 1.74 | 2.82 | 1.13 |
| 2018 | 1.39 | 1.96 | 1.02 |
| 2017 | 2.32 | 2.89 | 1.85 |
| 2016 | 2.44 | 2.89 | 1.97 |
| 2015 | 3.25 | 6.42 | 2.03 |
| 2014 | 2.41 | 3.47 | 1.94 |
| 2013 | 2.64 | 3.41 | 2.09 |
| 2012 | 3.34 | 4 | 2.42 |
| 2011 | 4.04 | 5.68 | 2.61 |
| 2010 | 3.73 | 4.83 | 2.63 |
| 2009 | 3.32 | 3.99 | 2.53 |
| 2008 | 4.8 | 8.08 | 1.46 |
| 2007 | 4.46 | 6.33 | 2.15 |
| 2006 | 1.94 | 2.37 | 1.54 |
| 2005 | 1.84 | 2.39 | 1.33 |
| 2004 | 2.59 | 3.4 | 1.91 |
| 2003 | 4.94 | 7.13 | 2.44 |
| 2002 | 3.49 | 4.06 | 2.75 |
| 2001 | 3.98 | 4.67 | 3.04 |
| 2000 | 4.06 | 5.68 | 2.76 |
| 1999 | 3.74 | 4.56 | 3.15 |
| 1998 | 3.55 | 4.3 | 2.78 |