| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.41 | 3.77 | 1.97 |
| 2024 | 1.63 | 2.08 | 1.16 |
| 2023 | 1.89 | 2.37 | 1.58 |
| 2022 | 1.58 | 2.3 | 0.92 |
| 2021 | 1.03 | 1.83 | 0.7 |
| 2020 | 1.59 | 2.45 | 1.08 |
| 2019 | 1.31 | 1.66 | 0.83 |
| 2018 | 1.26 | 1.88 | 0.82 |
| 2017 | 2.49 | 3.95 | 1.57 |
| 2016 | 3.38 | 4.54 | 2.71 |
| 2015 | 3.39 | 5.91 | 2.34 |
| 2014 | 1.88 | 2.83 | 1.51 |
| 2013 | 1.83 | 2.2 | 1.57 |
| 2012 | 1.73 | 2.12 | 1.41 |
| 2011 | 1.77 | 2.07 | 1.5 |
| 2010 | 1.93 | 2.58 | 1.34 |
| 2009 | 1.82 | 2.44 | 1 |
| 2008 | 1.4 | 2.36 | 0.72 |
| 2007 | 2.51 | 5.28 | 1.43 |
| 2006 | 1.14 | 1.43 | 0.84 |
| 2005 | 1.09 | 1.49 | 0.79 |
| 2004 | 1.61 | 2.27 | 1.29 |
| 2003 | 2.06 | 2.32 | 1.67 |
| 2002 | 2.6 | 3.41 | 1.97 |
| 2001 | 3.91 | 4.48 | 3.3 |
| 2000 | 6.05 | 7.35 | 5.13 |
| 1999 | 5.74 | 9.65 | 3.55 |