| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.24 | 2.36 | 2.09 |
| 2024 | 2.37 | 3.15 | 1.89 |
| 2023 | 3.17 | 3.5 | 2.87 |
| 2022 | 3.22 | 4.3 | 2.69 |
| 2021 | 3.42 | 4.85 | 2.72 |
| 2020 | 3.61 | 4.59 | 3.02 |
| 2019 | 3.23 | 4.14 | 2.71 |
| 2018 | 4.04 | 5.54 | 2.73 |
| 2017 | 6.67 | 9.79 | 5.09 |
| 2016 | 8.9 | 11.38 | 6.12 |
| 2015 | 9.35 | 15.24 | 5.39 |
| 2014 | 6.16 | 7.72 | 4.86 |
| 2013 | 6.79 | 8.49 | 4.59 |
| 2012 | 6.06 | 8.15 | 3.88 |
| 2011 | 10.96 | 13.28 | 6.28 |
| 2010 | 8.21 | 16.25 | 4.47 |
| 2009 | 4.42 | 5.65 | 3.2 |
| 2008 | 5.07 | 9.44 | 1.71 |
| 2007 | 7.67 | 11.77 | 5.68 |
| 2006 | 2.94 | 5.83 | 1.5 |
| 2005 | 1.85 | 2.51 | 1.3 |
| 2004 | 2.43 | 3.54 | 1.48 |
| 2003 | 3.25 | 4.14 | 2.55 |
| 2002 | 6.31 | 8.91 | 4.8 |
| 2001 | 10.35 | 12.68 | 6.16 |
| 2000 | 9.59 | 12.18 | 7.56 |
| 1999 | 7.52 | 10.74 | 5.86 |