| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.23 | 1.77 | 0.92 |
| 2024 | 1.07 | 1.4 | 0.82 |
| 2023 | 1.13 | 1.77 | 0.85 |
| 2022 | 1.03 | 1.43 | 0.84 |
| 2021 | 0.85 | 1.43 | 0.76 |
| 2020 | 0.92 | 1.09 | 0.79 |
| 2019 | 1.02 | 1.33 | 0.86 |
| 2018 | 1.15 | 1.78 | 0.81 |
| 2017 | 1.83 | 2.46 | 1.41 |
| 2016 | 1.92 | 2.24 | 1.64 |
| 2015 | 2.33 | 4.2 | 1.59 |
| 2014 | 1.4 | 1.85 | 1.05 |
| 2013 | 1.29 | 1.52 | 1.13 |
| 2012 | 1.51 | 1.84 | 1.24 |
| 2011 | 2.26 | 2.83 | 1.44 |
| 2010 | 3.31 | 6.32 | 2.43 |
| 2009 | 3.88 | 6.4 | 1.39 |
| 2008 | 7 | 22.21 | 1.18 |
| 2007 | 10.88 | 17.55 | 5.57 |
| 2006 | 5.72 | 17.17 | 2.88 |
| 2005 | 11.73 | 16.67 | 7.85 |
| 2004 | 8 | 11.1 | 5.63 |
| 2003 | 0 | -20.54 | |
| 2002 | 4.03 | 4.66 | 3.41 |
| 2001 | 6.56 | 9.31 | 4.28 |
| 2000 | 5.61 | 8.13 | 3.52 |
| 1999 | 3.92 | 4.97 | 3.07 |