| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.55 | 3.93 | 3.18 |
| 2024 | 3.77 | 4.99 | 3.08 |
| 2023 | 5.76 | 8.91 | 3.88 |
| 2022 | 10.18 | 14.35 | 6.6 |
| 2021 | 8.49 | 21.64 | 3.47 |
| 2020 | 2.31 | 3.68 | 1.69 |
| 2019 | 1.97 | 2.39 | 1.59 |
| 2018 | 2.68 | 4.01 | 1.66 |
| 2017 | 4.09 | 6.02 | 3.09 |
| 2016 | 5.5 | 7.29 | 4.13 |
| 2015 | 5.33 | 9.16 | 2.89 |
| 2014 | 3.54 | 5 | 2.63 |
| 2013 | 3.29 | 4.36 | 2.68 |
| 2012 | 3.84 | 4.84 | 2.59 |
| 2011 | 10.66 | 17.44 | 3.22 |
| 2010 | 13.48 | 20.6 | 9.53 |
| 2009 | 9.67 | 12.59 | 3.54 |
| 2008 | 5.91 | 11.99 | 2.39 |
| 2007 | 9.86 | 16.88 | 5.96 |
| 2006 | 4.63 | 6.99 | 2.63 |
| 2005 | 2.23 | 3.03 | 1.52 |
| 2004 | 2.91 | 3.68 | 2.34 |
| 2003 | 3.22 | 3.95 | 2.54 |
| 2002 | 4.56 | 5.32 | 4.01 |
| 2001 | 6.51 | 7.8 | 4.89 |
| 2000 | 7.36 | 10.08 | 5.01 |
| 1999 | 6.48 | 8.92 | 3.2 |
| 1998 | 3.81 | 4.69 | 2.93 |