| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.03 | 8.37 | 3.59 |
| 2024 | 3.54 | 5.21 | 2.4 |
| 2023 | 3.66 | 5.11 | 2.55 |
| 2022 | 2.16 | 2.99 | 1.71 |
| 2021 | 1.81 | 2.13 | 1.6 |
| 2020 | 2.46 | 3.26 | 1.76 |
| 2019 | 2.67 | 3.86 | 1.74 |
| 2018 | 2.21 | 2.88 | 1.66 |
| 2017 | 3.02 | 3.68 | 2.29 |
| 2016 | 4.3 | 6.23 | 3.53 |
| 2015 | 4.29 | 6.51 | 2.9 |
| 2014 | 3 | 3.63 | 2.29 |
| 2013 | 2.03 | 2.88 | 1.6 |
| 2012 | 2.13 | 2.75 | 1.55 |
| 2011 | 3.53 | 4.83 | 2.22 |
| 2010 | 4.95 | 6.22 | 3.78 |
| 2009 | 3.17 | 5.79 | 1.09 |
| 2008 | 2.16 | 3.41 | 0.84 |
| 2007 | 2.4 | 3.63 | 1.14 |
| 2006 | 1.16 | 1.39 | 0.93 |
| 2005 | 1.3 | 2.02 | 0.73 |
| 2004 | 2.78 | 5.07 | 1.77 |
| 2003 | 3.68 | 4.54 | 2.74 |
| 2002 | 3.38 | 4.11 | 2.45 |
| 2001 | 4.13 | 5.02 | 3.24 |
| 2000 | 5.09 | 7.32 | 3.16 |
| 1999 | 6.64 | 11.03 | 3.48 |
| 1998 | 4.29 | 5.68 | 2.98 |
| 1997 | 3.04 | 4.53 | 2.27 |