| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.06 | 3.28 | 2.88 |
| 2024 | 3.03 | 3.95 | 2.11 |
| 2023 | 4.08 | 4.85 | 3.6 |
| 2022 | 4.04 | 6.01 | 3.21 |
| 2021 | 4.68 | 6.7 | 3.62 |
| 2020 | 3.9 | 5.06 | 3.13 |
| 2019 | 2.98 | 4.17 | 2.4 |
| 2018 | 4.26 | 6.1 | 2.74 |
| 2017 | 5.09 | 6.37 | 4.34 |
| 2016 | 6.64 | 12.55 | 3.99 |
| 2015 | 12.14 | 17.43 | 8.67 |
| 2014 | 9.07 | 13.69 | 6.78 |
| 2013 | 7.56 | 9.44 | 6.2 |
| 2012 | 6.96 | 8.46 | 5.7 |
| 2011 | 8.3 | 10.76 | 6.61 |
| 2010 | 7.1 | 11.02 | 5.09 |
| 2009 | 5.23 | 6.09 | 4.26 |
| 2008 | 4.54 | 7.9 | 2.53 |
| 2007 | 2.69 | 3.67 | 1.42 |
| 2006 | 1.4 | 1.73 | 0.9 |
| 2005 | 1.17 | 1.57 | 0.91 |
| 2004 | 1.69 | 2.34 | 1.36 |
| 2003 | 1.96 | 2.39 | 1.53 |
| 2002 | 3.14 | 3.41 | 2.74 |
| 2001 | 4.86 | 7.07 | 3.19 |