| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.34 | 5.2 | 3.89 |
| 2024 | 3.44 | 5.3 | 2.62 |
| 2023 | 3.88 | 5.29 | 3.38 |
| 2022 | 3.88 | 4.75 | 3.16 |
| 2021 | 3.22 | 3.8 | 2.61 |
| 2020 | 2.99 | 3.18 | 2.85 |
| 2019 | 5.91 | 107.34 | 1.08 |
| 2018 | 1.67 | 2.81 | 1.02 |
| 2017 | 2.73 | 3.33 | 2.16 |
| 2016 | 3.84 | 5.4 | 3.08 |
| 2015 | 5.64 | 9.67 | 3.16 |
| 2014 | 4.68 | 6.28 | 3.38 |
| 2013 | 3.58 | 4.38 | 3.07 |
| 2012 | 3.56 | 4.44 | 2.63 |
| 2011 | 5.88 | 8.48 | 3.61 |
| 2010 | 7.11 | 8.88 | 5.83 |
| 2009 | 4.54 | 6.54 | 2.98 |
| 2008 | 5.28 | 11.29 | 2.54 |
| 2007 | 8.06 | 12.69 | 4.27 |
| 2006 | 5.24 | 7.75 | 3.81 |
| 2005 | 4.12 | 5.28 | 2.6 |
| 2004 | 4.32 | 6.86 | 2.56 |
| 2003 | 7.61 | 9.05 | 6.08 |
| 2002 | 16.66 | 36.36 | 7.61 |
| 2001 | 38.7 | 46.25 | 29.49 |
| 2000 | 24.26 | 38.86 | 12.63 |
| 1999 | 10.6 | 16.81 | 7.15 |
| 1998 | 6.58 | 11.32 | 3.94 |
| 1997 | 4.75 | 7.69 | 2.99 |