| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.07 | 2.83 | 1.85 |
| 2024 | 1.87 | 2.38 | 1.57 |
| 2023 | 2.16 | 2.52 | 1.88 |
| 2022 | 2.34 | 3.14 | 1.81 |
| 2021 | 2.2 | 3.8 | 1.67 |
| 2020 | 2.2 | 3.02 | 1.89 |
| 2019 | 2.86 | 3.58 | 2.39 |
| 2018 | 3.11 | 4.19 | 2.31 |
| 2017 | 4.47 | 7.36 | 2.96 |
| 2016 | 2.89 | 3.58 | 2.47 |
| 2015 | 7.48 | 15.42 | 2.4 |
| 2014 | 6.5 | 9.68 | 5.1 |
| 2013 | 5.6 | 6.55 | 4.56 |
| 2012 | 5.81 | 7.92 | 3.6 |
| 2011 | 5.34 | 7.29 | 3.55 |
| 2010 | 4.56 | 5.96 | 3.27 |
| 2009 | 3.83 | 6.01 | 2.07 |
| 2008 | 4.34 | 9.61 | 1.65 |
| 2007 | 7.86 | 13.45 | 4.07 |
| 2006 | 4.22 | 5.89 | 2.61 |
| 2005 | 2.21 | 2.8 | 1.76 |
| 2004 | 2.69 | 3.31 | 2.24 |
| 2003 | 3.21 | 4.07 | 2.42 |
| 2002 | 4.92 | 5.49 | 3.88 |
| 2001 | 5.85 | 6.61 | 4.78 |
| 2000 | 5.43 | 6.83 | 4.16 |
| 1999 | 4.46 | 5.66 | 3.78 |