| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.95 | 10.62 | 2.16 |
| 2024 | 1.6 | 2.66 | 0.97 |
| 2023 | 1.48 | 1.77 | 1.31 |
| 2022 | 1.52 | 2.99 | 1.18 |
| 2021 | 1.63 | 1.77 | 1.48 |
| 2020 | 1.85 | 2.4 | 1.67 |
| 2019 | 2.82 | 5.57 | 1.89 |
| 2018 | 4.18 | 6.5 | 2.73 |
| 2017 | 8.24 | 13.2 | 4.96 |
| 2016 | 8.69 | 13.59 | 4.82 |
| 2015 | 7.09 | 10.88 | 3.98 |
| 2014 | 4.65 | 8.05 | 4.22 |
| 2013 | 5.52 | 7.08 | 4.22 |
| 2012 | 5.58 | 10.5 | 2.59 |
| 2011 | 4.59 | 6.58 | 2.71 |
| 2010 | 3.95 | 5.23 | 3.01 |
| 2009 | 2.78 | 3.59 | 1.66 |
| 2008 | 2.47 | 3.99 | 1.3 |
| 2007 | 3.23 | 4.41 | 1.6 |
| 2006 | 1.48 | 1.73 | 1.17 |
| 2005 | 1.51 | 1.85 | 1.15 |
| 2004 | 2.18 | 2.89 | 1.69 |
| 2003 | 2.76 | 3.5 | 2 |
| 2002 | 4.07 | 4.64 | 3.24 |
| 2001 | 5.12 | 6.08 | 3.96 |
| 2000 | 4.48 | 5.3 | 3.63 |
| 1999 | 3.91 | 4.82 | 3.34 |
| 1998 | 4.1 | 5.1 | 3.41 |