| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.19 | 3.56 | 2.53 |
| 2024 | 2.37 | 4.82 | 1.93 |
| 2023 | 2.06 | 2.65 | 1.68 |
| 2022 | 2.06 | 2.49 | 1.73 |
| 2021 | 3.27 | 4.62 | 2.35 |
| 2020 | 3.75 | 4.62 | 3.03 |
| 2019 | 3.82 | 5.27 | 2.73 |
| 2018 | 4.19 | 6.15 | 2.75 |
| 2017 | 8.37 | 12.61 | 5.54 |
| 2016 | 7.31 | 14.32 | 4.63 |
| 2015 | 8.27 | 13.45 | 5.23 |
| 2014 | 8.13 | 9.39 | 6.66 |
| 2013 | 6.07 | 10.35 | 4.22 |
| 2012 | 4.95 | 7.84 | 3.26 |
| 2011 | 6 | 8.12 | 3.56 |
| 2010 | 5.92 | 8 | 3.86 |
| 2009 | 4.64 | 6.13 | 3.43 |
| 2008 | 5.61 | 10.04 | 1.89 |
| 2007 | 7.48 | 12.35 | 5.1 |
| 2006 | 2.54 | 5.09 | 1.06 |
| 2005 | 2.09 | 2.67 | 1.31 |
| 2004 | 5.92 | 12.23 | 2.36 |
| 2003 | 12.49 | 16.28 | 11.41 |
| 2002 | 10.84 | 15.1 | 7.69 |
| 2001 | 10.39 | 14.35 | 7.26 |
| 2000 | 5.58 | 8.32 | 2.78 |
| 1999 | 3.43 | 4.56 | 2.5 |
| 1998 | 2.26 | 3.06 | 1.38 |
| 1997 | 1.62 | 2.44 | 1.34 |