| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3.62 | 4.25 | 3.05 |
| 2023 | 3.31 | 4.19 | 2.6 |
| 2022 | 4.85 | 8.69 | 3.61 |
| 2021 | 4.87 | 9.19 | 1.84 |
| 2020 | 1.73 | 2.21 | 0.92 |
| 2019 | 2.49 | 3.53 | 1.64 |
| 2018 | 4.32 | 6.43 | 2.96 |
| 2017 | 5.58 | 7.05 | 4.57 |
| 2016 | 99.85 | 438.01 | 5.65 |
| 2015 | 31.23 | 66.45 | 16.68 |
| 2014 | 8.63 | 18.74 | 7.44 |
| 2013 | 9.74 | 11.8 | 7.66 |
| 2012 | 12.07 | 15.38 | 9.18 |
| 2011 | 17.97 | 27.7 | 9.42 |
| 2010 | 16.7 | 27.8 | 7.75 |
| 2009 | 7.58 | 11.29 | 3.06 |
| 2008 | 3.29 | 3.86 | 1.96 |
| 2007 | 2.98 | 4.57 | 1.2 |
| 2006 | 1.16 | 1.63 | 0.93 |
| 2005 | 0.94 | 1.13 | 0.73 |
| 2004 | 1.46 | 2 | 0.88 |
| 2003 | 2.05 | 2.54 | 1.43 |
| 2002 | 5.56 | 8.57 | 3.25 |
| 2001 | 9.86 | 12.24 | 7.8 |
| 2000 | 7.29 | 10.18 | 5 |
| 1999 | 3.4 | 4.54 | 2.62 |
| 1998 | 4.26 | 6.44 | 2.55 |
| 1997 | 5.73 | 8.23 | 3.94 |