| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 8.81 | 9.83 | 8.14 |
| 2024 | 6.45 | 11.3 | 4.19 |
| 2023 | 5.93 | 6.94 | 4.87 |
| 2022 | 4.36 | 8.04 | 2.62 |
| 2021 | 3.09 | 4.03 | 1.93 |
| 2020 | 2.79 | 3.33 | 2.44 |
| 2019 | 3.42 | 4.66 | 2.91 |
| 2018 | 3.74 | 6 | 2.79 |
| 2017 | 5.36 | 7.55 | 3.64 |
| 2016 | 5.48 | 6.78 | 4.51 |
| 2015 | 7.4 | 10.81 | 4.72 |
| 2014 | 3.35 | 5.63 | 2.13 |
| 2013 | 2.46 | 2.98 | 2.02 |
| 2012 | 2.41 | 2.94 | 1.97 |
| 2011 | 3.64 | 4.71 | 2.87 |
| 2010 | 4.78 | 6.68 | 3.15 |
| 2009 | 2.58 | 3.69 | 1.26 |
| 2008 | 2.25 | 4.62 | 0.91 |
| 2007 | 3.31 | 5.01 | 1.22 |
| 2006 | 1.24 | 1.42 | 0.93 |
| 2005 | 1.25 | 1.67 | 0.84 |
| 2004 | 1.93 | 2.61 | 1.56 |
| 2003 | 2.65 | 3.77 | 1.76 |
| 2002 | 4.36 | 4.88 | 3.24 |
| 2001 | 5.52 | 6.99 | 3.28 |