| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 9.3 | 9.57 | 8.97 |
| 2024 | 8.69 | 10.08 | 7.78 |
| 2023 | 9.26 | 11.75 | 6.44 |
| 2022 | 6.84 | 7.84 | 6.14 |
| 2021 | 7.3 | 10.51 | 5.17 |
| 2020 | 12.89 | 17.38 | 9.01 |
| 2019 | 11.9 | 13.73 | 10.67 |
| 2018 | 13.62 | 17.05 | 11.08 |
| 2017 | 20.93 | 26.82 | 16.43 |
| 2016 | 24.81 | 30.21 | 21.22 |
| 2015 | 19.86 | 30.2 | 13.38 |
| 2014 | 14.66 | 16.3 | 12.8 |
| 2013 | 17.36 | 21.57 | 15.65 |
| 2012 | 15.2 | 18.86 | 10.6 |
| 2011 | 26.75 | 37.6 | 18.04 |
| 2010 | 22.69 | 30.98 | 18.1 |
| 2009 | 16.13 | 25.47 | 9.08 |
| 2008 | 18.66 | 38.29 | 5.82 |
| 2007 | 51.18 | 105.04 | 28.15 |
| 2006 | 40.95 | 71.49 | 26.3 |
| 2005 | 111.88 | 246.45 | 9.77 |
| 2004 | 121.08 | 277.28 | 43.18 |
| 2003 | 39.27 | 43.12 | 31.63 |
| 2002 | 59.84 | 111.38 | 26.32 |
| 2001 | 22.84 | 44.18 | 10.42 |
| 2000 | 4 | 5.09 | 2.94 |
| 1999 | 3.44 | 7.62 | 1.53 |
| 1998 | 1.99 | 2.82 | 1.34 |
| 1997 | 2.56 | 3.34 | 1.62 |