| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.05 | 7.35 | 4.6 |
| 2024 | 5.12 | 8.19 | 3.65 |
| 2023 | 6.27 | 7.25 | 5.54 |
| 2022 | 8.07 | 10.9 | 5.9 |
| 2021 | 9.77 | 15.55 | 4.68 |
| 2020 | 13.18 | 29.18 | 5.93 |
| 2019 | 11.42 | 16.34 | 9.49 |
| 2018 | 14.96 | 20.64 | 9.75 |
| 2017 | 201.9 | 337.23 | 36.67 |
| 2016 | 23.54 | 46.8 | 13.21 |
| 2015 | 23.75 | 32.45 | 10.26 |
| 2014 | 9.03 | 12.52 | 6.98 |
| 2013 | 9.7 | 12.77 | 7.75 |
| 2012 | 8.9 | 14.58 | 5.99 |
| 2011 | 17.09 | 28.88 | 8.59 |
| 2010 | 23.74 | 30.76 | 19.52 |
| 2009 | 14.26 | 26.37 | 3.68 |
| 2008 | 6.86 | 15.13 | 2.71 |
| 2007 | 10.52 | 15.32 | 5.63 |
| 2006 | 3.38 | 5.73 | 1.34 |
| 2005 | 1.56 | 2.05 | 1.13 |
| 2004 | 3.04 | 5.02 | 1.91 |
| 2003 | 5.05 | 6.8 | 3.79 |
| 2002 | 3.95 | 5.19 | 2.16 |
| 2001 | 2.95 | 3.63 | 2.14 |
| 2000 | 5.2 | 6.67 | 3.78 |
| 1999 | 5.9 | 8.4 | 4.42 |
| 1998 | 4.92 | 7.11 | 3.84 |
| 1997 | 5.54 | 7.4 | 4.2 |