| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.47 | 1.79 | 1.28 |
| 2024 | 1.36 | 1.53 | 1.18 |
| 2023 | 1.66 | 1.87 | 1.48 |
| 2022 | 1.68 | 2.18 | 1.44 |
| 2021 | 2.32 | 3.61 | 1.77 |
| 2020 | 1.81 | 3.33 | 1.39 |
| 2019 | 1.63 | 1.91 | 1.31 |
| 2018 | 1.61 | 2.01 | 1.29 |
| 2017 | 2.01 | 2.37 | 1.78 |
| 2016 | 2.05 | 2.31 | 1.71 |
| 2015 | 2.45 | 4.32 | 1.76 |
| 2014 | 2.18 | 2.81 | 1.83 |
| 2013 | 2.96 | 3.52 | 2.35 |
| 2012 | 3.45 | 4.45 | 2.58 |
| 2011 | 3.55 | 4.28 | 2.92 |
| 2010 | 4.16 | 5.96 | 3.04 |
| 2009 | 3.37 | 4.59 | 2.25 |
| 2008 | 4.14 | 6.67 | 1.71 |
| 2007 | 5.01 | 6.62 | 3.42 |
| 2006 | 1.7 | 3.33 | 1.03 |
| 2005 | 1.26 | 1.56 | 1.03 |
| 2004 | 1.37 | 1.86 | 1.06 |
| 2003 | 1.94 | 2.71 | 1.18 |
| 2002 | 3.26 | 4.53 | 2.87 |
| 2001 | 4.17 | 4.68 | 3.48 |
| 2000 | 3.83 | 4.41 | 3.41 |
| 1999 | 4.17 | 5.34 | 3.16 |
| 1998 | 5.54 | 7.46 | 4.09 |