| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.29 | 1.4 | 1.19 |
| 2024 | 1.31 | 1.68 | 1.09 |
| 2023 | 1.61 | 1.84 | 1.41 |
| 2022 | 1.62 | 2.05 | 1.38 |
| 2021 | 1.8 | 2.66 | 1.48 |
| 2020 | 1.6 | 2.04 | 1.34 |
| 2019 | 1.91 | 2.37 | 1.62 |
| 2018 | 2.26 | 3.45 | 1.64 |
| 2017 | 3.55 | 4.32 | 2.91 |
| 2016 | 3.86 | 4.67 | 2.93 |
| 2015 | 5.16 | 8.89 | 3.31 |
| 2014 | 5.06 | 7.3 | 4.31 |
| 2013 | 0 | -1.28 | |
| 2012 | 194.05 | 518.89 | 4.58 |
| 2011 | 6.75 | 9.56 | 4.73 |
| 2010 | 4.94 | 8.27 | 3.24 |
| 2009 | 3.5 | 4.94 | 1.33 |
| 2008 | 2.83 | 6.65 | 1.01 |
| 2007 | 6.19 | 9 | 2.1 |
| 2006 | 1.74 | 2.71 | 0.98 |
| 2005 | 1.04 | 1.31 | 0.86 |
| 2004 | 1.55 | 2.1 | 1.15 |
| 2003 | 1.62 | 1.92 | 1.45 |
| 2002 | 1.92 | 2.28 | 1.51 |
| 2001 | 2.98 | 3.78 | 2.08 |
| 2000 | 3.33 | 4.2 | 2.38 |
| 1999 | 3.06 | 4.33 | 2.28 |
| 1998 | 4.36 | 5.65 | 2.85 |