| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.32 | 6.47 | 4.23 |
| 2024 | 5.32 | 7.61 | 3.05 |
| 2023 | 7.36 | 9.18 | 6.31 |
| 2022 | 7.74 | 9.6 | 6.21 |
| 2021 | 10.37 | 14.59 | 7.74 |
| 2020 | 7.76 | 10.53 | 5.56 |
| 2019 | 7.1 | 9.73 | 5.82 |
| 2018 | 9.01 | 18.9 | 5.28 |
| 2017 | 14.39 | 26.9 | 8.39 |
| 2016 | 13.08 | 16.37 | 10.92 |
| 2015 | 15.44 | 41.49 | 3.87 |
| 2014 | 4.11 | 5.52 | 3.01 |
| 2013 | 5.96 | 8.83 | 3.62 |
| 2012 | 7.84 | 10.52 | 4.17 |
| 2011 | 7.46 | 10.09 | 4.71 |
| 2010 | 9.77 | 13.92 | 7.11 |
| 2009 | 5.43 | 10.75 | 2.68 |
| 2008 | 5.13 | 11.63 | 1.52 |
| 2007 | 8.47 | 13.22 | 2.58 |
| 2006 | 2.17 | 2.81 | 1.68 |
| 2005 | 2.27 | 2.93 | 1.79 |
| 2004 | 3.44 | 4.53 | 2.66 |
| 2003 | 4.83 | 7.12 | 3.31 |
| 2002 | 7.54 | 8.67 | 6.26 |
| 2001 | 9.93 | 11.9 | 7.56 |
| 2000 | 10.08 | 14.01 | 7.45 |