| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.17 | 2.61 | 1.86 |
| 2024 | 1.7 | 2.29 | 1.35 |
| 2023 | 2.3 | 3.05 | 1.86 |
| 2022 | 3.03 | 4.45 | 2.19 |
| 2021 | 2.48 | 3.57 | 2.04 |
| 2020 | 2.32 | 2.8 | 2.04 |
| 2019 | 2.35 | 3.14 | 1.8 |
| 2018 | 2.49 | 3.7 | 1.71 |
| 2017 | 3.87 | 5.34 | 3.11 |
| 2016 | 3.78 | 4.76 | 2.59 |
| 2015 | 5.05 | 8.7 | 3.11 |
| 2014 | 4.25 | 5.35 | 3.37 |
| 2013 | 4.67 | 5.85 | 3.83 |
| 2012 | 6.85 | 10.22 | 4 |
| 2011 | 8.33 | 10.97 | 4.92 |
| 2010 | 6.45 | 12.25 | 3.7 |
| 2009 | 3.11 | 3.89 | 1.69 |
| 2008 | 3.76 | 7.93 | 1.33 |
| 2007 | 6.63 | 8.9 | 4.88 |
| 2006 | 5.48 | 7.73 | 3.98 |
| 2005 | 4.26 | 5.6 | 3.12 |
| 2004 | 5.33 | 13.52 | 3.25 |
| 2003 | 11.24 | 12.64 | 9.83 |
| 2002 | 11.37 | 14.09 | 8.17 |
| 2001 | 14.04 | 19.08 | 9.67 |