| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.82 | 2.29 | 1.6 |
| 2024 | 1.74 | 2.18 | 1.2 |
| 2023 | 2.49 | 3.51 | 1.43 |
| 2022 | 6.01 | 11.69 | 3.05 |
| 2021 | 14.89 | 28.66 | 7.79 |
| 2020 | 40.9 | 168.46 | 1.97 |
| 2019 | 2.67 | 4.41 | 2.12 |
| 2018 | 4.81 | 13.97 | 0.57 |
| 2017 | 0.92 | 1.1 | 0.76 |
| 2016 | 0.85 | 1.04 | 0.74 |
| 2015 | 1.13 | 1.83 | 0.82 |
| 2014 | 0.84 | 1.13 | 0.7 |
| 2013 | 1.23 | 1.91 | 0.87 |
| 2012 | 2.27 | 3.63 | 1.37 |
| 2011 | 3.67 | 4.54 | 2.5 |
| 2010 | 4.48 | 6.57 | 3.04 |
| 2009 | 3.89 | 5.66 | 2.18 |
| 2008 | 5.33 | 10.6 | 1.63 |
| 2007 | 4.99 | 8.35 | 1.91 |
| 2006 | 1.73 | 2.33 | 1.16 |
| 2005 | 1.38 | 2.32 | 1.03 |
| 2004 | 2 | 2.46 | 1.69 |
| 2003 | 2.17 | 2.6 | 1.77 |
| 2002 | 2.86 | 3.15 | 2.37 |
| 2001 | 3.52 | 4.26 | 2.77 |
| 2000 | 3.71 | 4.11 | 3.25 |
| 1999 | 4.31 | 5.67 | 3.25 |
| 1998 | 6.45 | 10.18 | 4.1 |
| 1997 | 6.71 | 9.56 | 4.06 |