| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.72 | 3.27 | 2.25 |
| 2024 | 2.26 | 3.32 | 1.73 |
| 2023 | 3.14 | 4.41 | 2.28 |
| 2022 | 2.67 | 4.74 | 1.69 |
| 2021 | 1.98 | 2.67 | 1.44 |
| 2020 | 2.59 | 3.85 | 1.72 |
| 2019 | 2.28 | 2.85 | 1.61 |
| 2018 | 1.76 | 2.23 | 1.39 |
| 2017 | 2.32 | 3.26 | 1.77 |
| 2016 | 3.44 | 4.14 | 2.72 |
| 2015 | 4.76 | 9.82 | 2.42 |
| 2014 | 1.93 | 3.26 | 1.34 |
| 2013 | 1.36 | 1.82 | 1.06 |
| 2012 | 1.39 | 1.77 | 1.01 |
| 2011 | 2.13 | 3 | 1.34 |
| 2010 | 2.72 | 3.43 | 1.91 |
| 2009 | 2.27 | 3.19 | 1.37 |
| 2008 | 3.25 | 6.16 | 0.96 |
| 2007 | 2.89 | 4.08 | 1.55 |
| 2006 | 1.59 | 2.23 | 1.29 |
| 2005 | 1.45 | 2.14 | 1.09 |
| 2004 | 2.32 | 3.42 | 1.82 |
| 2003 | 3.03 | 3.98 | 2.11 |
| 2002 | 4.87 | 5.61 | 4.33 |
| 2001 | 7.35 | 9.33 | 5.17 |
| 2000 | 9.59 | 13.9 | 8.17 |