| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.33 | 9.51 | 2.5 |
| 2024 | 1.68 | 4.27 | 1.11 |
| 2023 | 1.99 | 2.91 | 1.57 |
| 2022 | 3.58 | 5.35 | 2.08 |
| 2021 | 2.67 | 5.43 | 0.87 |
| 2020 | 1.07 | 1.36 | 0.77 |
| 2019 | 1.1 | 1.52 | 0.87 |
| 2018 | 1.61 | 2.92 | 0.81 |
| 2017 | 2.63 | 3.17 | 2.22 |
| 2016 | 3.3 | 5.05 | 2.41 |
| 2015 | 3.55 | 6 | 1.75 |
| 2014 | 1.63 | 1.99 | 1.4 |
| 2013 | 1.78 | 2.14 | 1.48 |
| 2012 | 2.07 | 2.7 | 1.56 |
| 2011 | 3.4 | 5.77 | 1.67 |
| 2010 | 2.43 | 4.02 | 1.63 |
| 2009 | 1.72 | 2.27 | 1.1 |
| 2008 | 1.66 | 2.73 | 0.79 |
| 2007 | 2.16 | 2.98 | 1.31 |
| 2006 | 1.32 | 1.65 | 1.09 |
| 2005 | 1.34 | 1.79 | 0.97 |
| 2004 | 1.82 | 2.28 | 1.52 |
| 2003 | 2.4 | 3.13 | 1.57 |
| 2002 | 3.64 | 4.3 | 3.02 |
| 2001 | 5.92 | 8.48 | 3.61 |
| 2000 | 6.97 | 9.54 | 5.2 |
| 1999 | 5.84 | 7.97 | 4.21 |