| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.97 | 3.48 | 2.5 |
| 2024 | 2.63 | 3.57 | 1.63 |
| 2023 | 3.23 | 4.89 | 2.35 |
| 2022 | 3.17 | 4.15 | 2.42 |
| 2021 | 4.17 | 5.73 | 3.21 |
| 2020 | 4.66 | 6.68 | 3.21 |
| 2019 | 3.78 | 6.29 | 2.26 |
| 2018 | 2.88 | 4.01 | 1.75 |
| 2017 | 4.42 | 5.27 | 3.55 |
| 2016 | 9.67 | 16.24 | 4.73 |
| 2015 | 12.67 | 29.02 | 7.86 |
| 2014 | 13.8 | 19 | 9.97 |
| 2013 | 12.74 | 18.55 | 8.46 |
| 2012 | 52.98 | 193.44 | 13.46 |
| 2011 | 74.53 | 199.92 | 44.31 |
| 2010 | 31.01 | 64.45 | 14.57 |
| 2009 | 14.06 | 14.57 | 13.4 |
| 2008 | 12.61 | 13.8 | 10.58 |
| 2007 | 9.64 | 15.01 | 3.58 |
| 2006 | 3.85 | 5.48 | 2.81 |
| 2005 | 2.99 | 3.88 | 2.18 |
| 2004 | 4.99 | 7.7 | 2.96 |
| 2003 | 31.37 | 84.84 | 5.38 |
| 2002 | 54.16 | 84.58 | 8.47 |
| 2001 | 13.88 | 17.35 | 11.66 |
| 2000 | 12 | 15.03 | 7.38 |
| 1999 | 8.05 | 9.57 | 6.63 |
| 1998 | 5.16 | 6.35 | 3.65 |
| 1997 | 5.75 | 8.56 | 3.47 |