| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.62 | 3.41 | 1.85 |
| 2023 | 2.98 | 3.55 | 2.18 |
| 2022 | 2.38 | 3.22 | 1.86 |
| 2021 | 2.64 | 3.09 | 2.2 |
| 2020 | 3.03 | 3.98 | 2.54 |
| 2019 | 3.19 | 3.89 | 2.73 |
| 2018 | 3.36 | 4.58 | 2.49 |
| 2017 | 6.93 | 8.49 | 3.86 |
| 2016 | 7.71 | 10 | 6.73 |
| 2015 | 11.35 | 20.04 | 7.4 |
| 2014 | 6.5 | 9.15 | 4.46 |
| 2013 | 4.7 | 6.12 | 2.84 |
| 2012 | 3.62 | 4.74 | 2.39 |
| 2011 | 5.8 | 8.06 | 3.97 |
| 2010 | 7.3 | 9.99 | 4.89 |
| 2009 | 5.07 | 9.16 | 2.08 |
| 2008 | 4.89 | 11.08 | 1.61 |
| 2007 | 6.27 | 9.93 | 3.28 |
| 2006 | 3.97 | 5.1 | 3.1 |
| 2005 | 3.76 | 5.13 | 2.82 |
| 2004 | 3.44 | 4.5 | 2.94 |
| 2003 | 2.81 | 3.32 | 2.45 |
| 2002 | 4.42 | 4.76 | 3.82 |
| 2001 | 6.09 | 7.64 | 4.06 |