| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.77 | 6.42 | 4.9 |
| 2024 | 5.34 | 7.65 | 3.6 |
| 2023 | 7.61 | 9.56 | 5.38 |
| 2022 | 5.38 | 6.68 | 4.24 |
| 2021 | 5.52 | 7.51 | 4.64 |
| 2020 | 7.61 | 10.23 | 5.36 |
| 2019 | 9.66 | 13.59 | 7.39 |
| 2018 | 9.56 | 14.84 | 5.46 |
| 2017 | 16.4 | 18.53 | 13.42 |
| 2016 | 17.3 | 20.58 | 12.82 |
| 2015 | 15.33 | 18.07 | 9.52 |
| 2014 | 7.72 | 9.54 | 5.32 |
| 2013 | 5.76 | 7.12 | 4.57 |
| 2012 | 5.68 | 8.37 | 4.24 |
| 2011 | 10.16 | 16.04 | 5.35 |
| 2010 | 13.36 | 16.65 | 10.19 |
| 2009 | 11 | 16.41 | 4.29 |
| 2008 | 6.17 | 13.89 | 2.27 |
| 2007 | 6.32 | 13.25 | 1.84 |
| 2006 | 1.93 | 2.5 | 1.37 |
| 2005 | 2.45 | 3.8 | 1.54 |
| 2004 | 4.32 | 5.83 | 3.2 |
| 2003 | 5.16 | 6.75 | 3.61 |
| 2002 | 7.29 | 9.01 | 4.32 |
| 2001 | 8.19 | 9.94 | 6.23 |
| 2000 | 7.08 | 8.72 | 5.37 |
| 1999 | 3.73 | 5.8 | 2.36 |
| 1998 | 2.8 | 4.21 | 2.12 |
| 1997 | 3.23 | 5.32 | 2.19 |