| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.83 | 8.34 | 7.3 |
| 2024 | 7.47 | 10.55 | 6.54 |
| 2023 | 8.73 | 9.76 | 6.18 |
| 2022 | 9.93 | 12.08 | 7.48 |
| 2021 | 11.53 | 15.31 | 7.97 |
| 2020 | 7.31 | 11.48 | 4.29 |
| 2019 | 5.38 | 6.48 | 4.58 |
| 2018 | 31.26 | 137.91 | 5.23 |
| 2017 | 30.33 | 124.5 | 18.56 |
| 2016 | 8.79 | 17.68 | 6.41 |
| 2015 | 9.68 | 16.96 | 5.44 |
| 2014 | 4.23 | 7.49 | 2.3 |
| 2013 | 2.7 | 3.56 | 2.3 |
| 2012 | 3.14 | 4.81 | 2.36 |
| 2011 | 6.27 | 12.14 | 2.96 |
| 2010 | 6.02 | 11.97 | 3.81 |
| 2009 | 3.93 | 5.48 | 1.97 |
| 2008 | 2.97 | 5.09 | 1.42 |
| 2007 | 3.17 | 5.63 | 1.21 |
| 2006 | 1.15 | 1.37 | 0.92 |
| 2005 | 1.11 | 1.48 | 0.95 |
| 2004 | 2.61 | 5.42 | 1.09 |
| 2003 | 2.14 | 2.59 | 1.63 |
| 2002 | 2.66 | 3.39 | 1.76 |
| 2001 | 3.26 | 3.89 | 2.52 |
| 2000 | 3.23 | 3.92 | 2.61 |
| 1999 | 3.63 | 4.9 | 2.57 |
| 1998 | 7 | 10.67 | 4.2 |
| 1997 | 7.7 | 10.61 | 4.64 |