| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.49 | 11.05 | 6.39 |
| 2024 | 5.74 | 11.74 | 3.55 |
| 2023 | 6.08 | 7.31 | 5.29 |
| 2022 | 7.47 | 10.83 | 6.12 |
| 2021 | 8.23 | 9.36 | 7.25 |
| 2020 | 9.77 | 12.13 | 8.37 |
| 2019 | 10.73 | 17.01 | 7.45 |
| 2018 | 10.52 | 14.01 | 7.3 |
| 2017 | 16.37 | 23.76 | 12.24 |
| 2016 | 20.69 | 25.48 | 16.08 |
| 2015 | 59.57 | 162.93 | 21.47 |
| 2014 | 8.69 | 21.47 | 3.91 |
| 2013 | 4.97 | 6.34 | 4.1 |
| 2012 | 9.65 | 10.03 | 7.31 |
| 2011 | 5.72 | 10.03 | 3.16 |
| 2010 | 4.18 | 6.08 | 2.87 |
| 2009 | 4.66 | 10.05 | 1.61 |
| 2008 | 4.21 | 11.14 | 1.24 |
| 2007 | 5.26 | 9.85 | 1.85 |
| 2006 | 1.65 | 1.99 | 1.4 |
| 2005 | 2.21 | 3.42 | 1.75 |
| 2004 | 3.28 | 4.64 | 2.62 |
| 2003 | 2.46 | 4.39 | 2.09 |
| 2002 | 5.14 | 5.9 | 4.06 |
| 2001 | 7.36 | 9.24 | 5.31 |
| 2000 | 7.4 | 9.01 | 5.34 |
| 1999 | 7.16 | 10.74 | 4.51 |
| 1998 | 9.05 | 15.6 | 4.88 |
| 1997 | 6.49 | 9.24 | 3.98 |