| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.2 | 1.34 | 1.08 |
| 2024 | 1.23 | 1.39 | 1.09 |
| 2023 | 1.9 | 2.98 | 1.32 |
| 2022 | 2.25 | 2.93 | 1.67 |
| 2021 | 2.39 | 4.29 | 1.57 |
| 2020 | 52.16 | 146.63 | 14.22 |
| 2019 | 9.63 | 20.32 | 3.85 |
| 2018 | 5.39 | 7.7 | 3.51 |
| 2017 | 7.98 | 9.65 | 6.36 |
| 2016 | 6.58 | 9.76 | 4.29 |
| 2015 | 6.3 | 12.49 | 3.85 |
| 2014 | 3.61 | 4.53 | 2.97 |
| 2013 | 3.3 | 4.27 | 2.69 |
| 2012 | 3.19 | 3.97 | 2.72 |
| 2011 | 4.78 | 6.51 | 2.83 |
| 2010 | 4.63 | 6.13 | 3.65 |
| 2009 | 3.34 | 4.65 | 1.84 |
| 2008 | 3.57 | 7.9 | 1.46 |
| 2007 | 5.55 | 9.72 | 2.11 |
| 2006 | 2.04 | 2.85 | 1.23 |
| 2005 | 1.28 | 1.54 | 1.04 |
| 2004 | 1.96 | 2.56 | 1.48 |
| 2003 | 2.26 | 2.57 | 1.87 |
| 2002 | 2.94 | 3.66 | 1.84 |
| 2001 | 3.95 | 5.06 | 2.79 |
| 2000 | 3.68 | 5.57 | 2.6 |
| 1999 | 2.44 | 3.28 | 1.82 |
| 1998 | 2.88 | 4.46 | 1.92 |
| 1997 | 3.36 | 4.71 | 2.65 |