| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.31 | 4.18 | 2.09 |
| 2024 | 2.27 | 3.03 | 1.65 |
| 2023 | 2.56 | 3.48 | 1.82 |
| 2022 | 3 | 3.8 | 1.91 |
| 2021 | 2.55 | 4.66 | 1.52 |
| 2020 | 1.73 | 2.45 | 1.43 |
| 2019 | 1.8 | 2.24 | 1.42 |
| 2018 | 2 | 2.62 | 1.4 |
| 2017 | 2.84 | 3.44 | 2.37 |
| 2016 | 3.33 | 4.2 | 2.41 |
| 2015 | 3.3 | 5.37 | 2.06 |
| 2014 | 7.13 | 26.28 | 1.93 |
| 2013 | 12 | 24.08 | 7.69 |
| 2012 | 0 | ||
| 2011 | 0 | ||
| 2010 | 6.43 | 7.23 | 5.43 |
| 2009 | 5.78 | 8.38 | 2.53 |
| 2008 | 4.91 | 10.19 | 1.89 |
| 2007 | 7.95 | 14.84 | 3.63 |
| 2006 | 3.29 | 5.31 | 1.06 |
| 2005 | 1.1 | 1.52 | 0.86 |
| 2004 | 1.84 | 2.59 | 1.28 |
| 2003 | 2.43 | 2.81 | 1.86 |
| 2002 | 3.36 | 3.79 | 2.56 |
| 2001 | 4.49 | 6.15 | 2.98 |
| 2000 | 5.21 | 6.28 | 3.72 |
| 1999 | 5.77 | 9.21 | 4.12 |
| 1998 | 4.6 | 6.63 | 3.31 |
| 1997 | 4.66 | 7.16 | 3.36 |