| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 16.35 | 18.2 | 13.77 |
| 2024 | 13.87 | 22.48 | 10.29 |
| 2023 | 12 | 17.39 | 10.31 |
| 2022 | 10.32 | 13.63 | 6.25 |
| 2021 | 10.78 | 16.55 | 7.23 |
| 2020 | 15.38 | 22.64 | 7.84 |
| 2019 | 10.38 | 20.19 | 3.21 |
| 2018 | 4.41 | 6.28 | 3.19 |
| 2017 | 5.44 | 7.62 | 4.09 |
| 2016 | 6.73 | 9.98 | 4.93 |
| 2015 | 8.37 | 16.26 | 5.38 |
| 2014 | 5.73 | 7.82 | 4.1 |
| 2013 | 4.38 | 10.09 | 2.11 |
| 2012 | 2.54 | 3.36 | 1.88 |
| 2011 | 3.81 | 4.55 | 2.59 |
| 2010 | 4.29 | 5.53 | 3.05 |
| 2009 | 4.05 | 5.09 | 2.34 |
| 2008 | 3.45 | 5.39 | 2.06 |
| 2007 | 3.94 | 6.2 | 1.64 |
| 2006 | 1.66 | 2.09 | 1.35 |
| 2005 | 1.91 | 2.57 | 1.44 |
| 2004 | 3.32 | 5.43 | 2.13 |
| 2003 | 6.75 | 8.11 | 3.79 |
| 2002 | 8.12 | 9.18 | 6.76 |
| 2001 | 8.25 | 9.71 | 7.13 |
| 2000 | 7.1 | 8.55 | 5.98 |
| 1999 | 7.05 | 11.26 | 4.81 |