| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.57 | 1.79 | 1.37 |
| 2024 | 1.32 | 1.83 | 0.97 |
| 2023 | 1.58 | 1.76 | 1.38 |
| 2022 | 1.54 | 1.8 | 1.16 |
| 2021 | 1.45 | 1.8 | 1.16 |
| 2020 | 1.71 | 2.54 | 1.38 |
| 2019 | 1.7 | 2.3 | 1.23 |
| 2018 | 1.75 | 2.65 | 1.13 |
| 2017 | 3.35 | 4.39 | 2.33 |
| 2016 | 3.55 | 4.79 | 2.71 |
| 2015 | 5.35 | 11.01 | 2.34 |
| 2014 | 3.66 | 5.34 | 2.49 |
| 2013 | 2.97 | 3.75 | 2.28 |
| 2012 | 3.08 | 4.36 | 1.79 |
| 2011 | 5.26 | 6.52 | 3.15 |
| 2010 | 4.04 | 6.1 | 2.77 |
| 2009 | 2.49 | 4.31 | 1.24 |
| 2008 | 2.43 | 5.53 | 0.94 |
| 2007 | 4.39 | 6.47 | 1.76 |
| 2006 | 1.58 | 1.97 | 1.21 |
| 2005 | 1.65 | 2.74 | 1 |
| 2004 | 3.44 | 5.08 | 2.5 |
| 2003 | 4.13 | 4.77 | 3.34 |
| 2002 | 4.1 | 4.78 | 3.55 |
| 2001 | 5.74 | 7.14 | 4.13 |
| 2000 | 7.86 | 9.7 | 5.8 |
| 1999 | 4.79 | 7.41 | 2.6 |