| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.43 | 1.72 | 1.27 |
| 2024 | 1.15 | 1.73 | 0.79 |
| 2023 | 2.63 | 5.86 | 1.03 |
| 2022 | 2.79 | 5.89 | 2.01 |
| 2021 | 1.8 | 2.93 | 1.55 |
| 2020 | 2.38 | 3.91 | 2.03 |
| 2019 | 2.8 | 5.03 | 2.12 |
| 2018 | 2.71 | 3.58 | 2.05 |
| 2017 | 3.48 | 4.58 | 2.87 |
| 2016 | 3.65 | 4.65 | 2.43 |
| 2015 | 3.93 | 4.71 | 3.37 |
| 2014 | 2.42 | 3.67 | 1.54 |
| 2013 | 1.61 | 1.85 | 1.34 |
| 2012 | 1.74 | 2.55 | 1.3 |
| 2011 | 3.69 | 5.55 | 1.7 |
| 2010 | 5.63 | 8.52 | 3.63 |
| 2009 | 4.68 | 7.78 | 2.41 |
| 2008 | 2.89 | 4.55 | 1.56 |
| 2007 | 3.81 | 7.39 | 1.36 |
| 2006 | 1.31 | 1.59 | 1.11 |
| 2005 | 1.62 | 2.43 | 1.05 |
| 2004 | 2.54 | 3.28 | 1.71 |
| 2003 | 2.79 | 3.66 | 2.13 |
| 2002 | 3.89 | 4.54 | 2.84 |
| 2001 | 4.88 | 6.1 | 3.49 |
| 2000 | 4.28 | 6.12 | 2.48 |
| 1999 | 4.12 | 5.38 | 3.17 |
| 1998 | 4.64 | 6.37 | 3.77 |
| 1997 | 6.38 | 9.81 | 3.35 |