| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.67 | 6.26 | 5.08 |
| 2024 | 4.34 | 7.92 | 3.28 |
| 2023 | 4.61 | 6.94 | 3.54 |
| 2022 | 4.62 | 7.78 | 3.56 |
| 2021 | 3.28 | 3.98 | 2.93 |
| 2020 | 3.68 | 4.57 | 3.14 |
| 2019 | 3.86 | 4.81 | 3.42 |
| 2018 | 4.18 | 5.92 | 3.09 |
| 2017 | 7.44 | 10.25 | 5.23 |
| 2016 | 9.28 | 11.65 | 6.78 |
| 2015 | 9.44 | 15.05 | 5.3 |
| 2014 | 7.48 | 9.04 | 6.12 |
| 2013 | 6.85 | 8.2 | 5.41 |
| 2012 | 6.35 | 9.69 | 4.97 |
| 2011 | 7.69 | 10.33 | 5.34 |
| 2010 | 9.41 | 13.35 | 6.08 |
| 2009 | 10.05 | 13.35 | 7.54 |
| 2008 | 16.7 | 44.75 | 6.19 |
| 2007 | 34.52 | 68.03 | 10.47 |
| 2006 | 8.06 | 13.24 | 4.83 |
| 2005 | 2.72 | 5.24 | 0.42 |
| 2004 | 1.21 | 1.76 | 0.77 |
| 2003 | 1.6 | 1.89 | 1.26 |
| 2002 | 2.54 | 2.66 | 2.46 |