| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.38 | 8.25 | 6.72 |
| 2024 | 6.33 | 9.4 | 4.24 |
| 2023 | 5.8 | 7.09 | 4.57 |
| 2022 | 2.87 | 6.6 | 2.22 |
| 2021 | 2.38 | 3.04 | 1.85 |
| 2020 | 2.47 | 3.29 | 1.76 |
| 2019 | 2.78 | 4.92 | 2.1 |
| 2018 | 2.47 | 3.62 | 1.53 |
| 2017 | 3.81 | 4.54 | 3.1 |
| 2016 | 4.05 | 5.05 | 3.19 |
| 2015 | 4.93 | 8.18 | 2.97 |
| 2014 | 3.35 | 5 | 2.72 |
| 2013 | 2.98 | 3.66 | 2.57 |
| 2012 | 3.22 | 4.19 | 2.3 |
| 2011 | 4.97 | 7.53 | 2.88 |
| 2010 | 4.24 | 5.87 | 3.06 |
| 2009 | 3.21 | 4.2 | 1.72 |
| 2008 | 2.99 | 4.9 | 1.3 |
| 2007 | 3.74 | 5.28 | 1.96 |
| 2006 | 1.81 | 2.16 | 1.4 |
| 2005 | 1.88 | 2.57 | 1.31 |
| 2004 | 2.72 | 3.71 | 2.29 |
| 2003 | 3.58 | 4.55 | 2.59 |
| 2002 | 4.71 | 5.62 | 3 |
| 2001 | 6.1 | 7.27 | 4.21 |
| 2000 | 7.78 | 11.02 | 5.49 |
| 1999 | 6.33 | 7.75 | 4.6 |
| 1998 | 6.52 | 8.6 | 4.33 |
| 1997 | 6.24 | 10.18 | 3.63 |