| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3 | 3.92 | 2.75 |
| 2024 | 2.55 | 3.98 | 1.64 |
| 2023 | 3.15 | 3.73 | 2.43 |
| 2022 | 3.06 | 4.25 | 2.35 |
| 2021 | 3.55 | 4.77 | 2.96 |
| 2020 | 4.72 | 10.24 | 3.39 |
| 2019 | 4.15 | 5.4 | 2.86 |
| 2018 | 4.48 | 6.52 | 2.69 |
| 2017 | 8.45 | 11.29 | 5.67 |
| 2016 | 12.05 | 18.15 | 10.22 |
| 2015 | 13.27 | 20.7 | 7.36 |
| 2014 | 7.7 | 13.57 | 5.31 |
| 2013 | 4.11 | 7.22 | 2.95 |
| 2012 | 3.98 | 6.07 | 2.64 |
| 2011 | 5.68 | 7.14 | 3.97 |
| 2010 | 5.87 | 8.82 | 4.19 |
| 2009 | 4.39 | 6.53 | 1.99 |
| 2008 | 3.74 | 7.92 | 1.42 |
| 2007 | 5.94 | 8.69 | 3.31 |
| 2006 | 3.58 | 5.52 | 2.35 |
| 2005 | 2.56 | 4.69 | 1.53 |
| 2004 | 3.89 | 5.25 | 2.95 |
| 2003 | 6 | 8.74 | 3.55 |
| 2002 | 9.67 | 13.65 | 6.68 |
| 2001 | 15.1 | 17.41 | 13 |
| 2000 | 238.42 | 1109.52 | 55.59 |
| 1999 | 22.87 | 34.7 | 13.41 |
| 1998 | 6.11 | 9.79 | 3.08 |
| 1997 | 3.21 | 4.43 | 2.58 |