| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.65 | 3.17 | 2.24 |
| 2023 | 3.29 | 4.62 | 2.43 |
| 2022 | 3.6 | 4.6 | 2.82 |
| 2021 | 4.77 | 7.16 | 3.59 |
| 2020 | 2.22 | 5.43 | 1.06 |
| 2019 | 1.49 | 1.88 | 1.22 |
| 2018 | 2.23 | 3.27 | 1.44 |
| 2017 | 3.06 | 3.67 | 2.59 |
| 2016 | 2.84 | 3.73 | 2.39 |
| 2015 | 3.65 | 5.64 | 2.49 |
| 2014 | 3.24 | 4.34 | 2.65 |
| 2013 | 4.47 | 10.65 | 2.92 |
| 2012 | 3.94 | 5.43 | 2.63 |
| 2011 | 7.09 | 13.95 | 4.17 |
| 2010 | 8.48 | 10.39 | 6.1 |
| 2009 | 5.72 | 7.66 | 3.79 |
| 2008 | 5.64 | 10.91 | 2.67 |
| 2007 | 4.75 | 7.61 | 2.47 |
| 2006 | 2.33 | 3.1 | 1.24 |
| 2005 | 1.74 | 2.34 | 1.28 |
| 2004 | 2.77 | 3.39 | 2.24 |
| 2003 | 2.95 | 3.75 | 2.05 |
| 2002 | 3.8 | 4.44 | 2.86 |
| 2001 | 4.93 | 6.2 | 3.45 |
| 2000 | 4.81 | 5.75 | 3.08 |
| 1999 | 5.44 | 6.97 | 4.13 |
| 1998 | 5.27 | 6.22 | 4.08 |
| 1997 | 4.37 | 8.94 | 2.11 |