| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 9.03 | 10.4 | 8.12 |
| 2024 | 8.18 | 10.22 | 6.45 |
| 2023 | 2.79 | 7.31 | 0.5 |
| 2022 | 3.95 | 5.51 | 3.31 |
| 2021 | 6.8 | 9.2 | 4.16 |
| 2020 | 6.37 | 7.59 | 4.94 |
| 2019 | 7.74 | 10.1 | 4.94 |
| 2018 | 12.43 | 17.77 | 9.52 |
| 2017 | 23.85 | 29.81 | 15.53 |
| 2016 | 24.82 | 31.18 | 16.7 |
| 2015 | 14.88 | 20.35 | 8.99 |
| 2014 | 7.82 | 10.23 | 6.77 |
| 2013 | 10.29 | 13.61 | 8.1 |
| 2012 | 8.29 | 12.62 | 6.03 |
| 2011 | 11.49 | 17.42 | 5.8 |
| 2010 | 12.94 | 16.49 | 10.24 |
| 2009 | 20.44 | 62.63 | 4.16 |
| 2008 | 15.21 | 36.83 | 3.04 |
| 2007 | 31.46 | 49.15 | 15.82 |
| 2006 | 16.56 | 20.52 | 14.87 |
| 2005 | 3.43 | 15.6 | 0.57 |
| 2004 | 0.91 | 1.24 | 0.69 |
| 2003 | 1.15 | 1.33 | 0.64 |
| 2002 | 0.96 | 1.04 | 0.83 |
| 2001 | 0.99 | 1.6 | 0.47 |
| 2000 | 0.62 | 0.91 | 0.42 |
| 1999 | 0.43 | 0.81 | 0.25 |
| 1998 | 0.53 | 0.82 | 0.38 |
| 1997 | 0.67 | 1.1 | 0.3 |