| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.76 | 7.03 | 4.8 |
| 2024 | 4.2 | 7.91 | 3.06 |
| 2023 | 4.74 | 6.72 | 3.9 |
| 2022 | 4.19 | 5.02 | 3.33 |
| 2021 | 3.86 | 5.45 | 3.3 |
| 2020 | 4.45 | 5.45 | 3.52 |
| 2019 | 5.13 | 7.39 | 4.05 |
| 2018 | 6.41 | 9.03 | 4.65 |
| 2017 | 11.24 | 17.92 | 7.37 |
| 2016 | 8.86 | 11.66 | 6.66 |
| 2015 | 10.02 | 14.77 | 4.81 |
| 2014 | 5.65 | 11.21 | 3.44 |
| 2013 | 3.51 | 4.57 | 2.81 |
| 2012 | 3.91 | 5.36 | 2.75 |
| 2011 | 6.34 | 8.93 | 3.78 |
| 2010 | 6.02 | 8.61 | 4.34 |
| 2009 | 4.6 | 6.75 | 2.39 |
| 2008 | 3.62 | 7.37 | 1.67 |
| 2007 | 5.59 | 8.19 | 2.06 |
| 2006 | 1.99 | 2.6 | 1.65 |
| 2005 | 1.82 | 2.61 | 1.21 |
| 2004 | 3.2 | 4.41 | 2.35 |
| 2003 | 4.49 | 5.62 | 3.25 |
| 2002 | 5.53 | 6.45 | 3.76 |
| 2001 | 9.29 | 11.81 | 7.15 |
| 2000 | 9.63 | 12.26 | 7.66 |
| 1999 | 5.68 | 7.85 | 4.3 |