| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.26 | 1.34 | 1.18 |
| 2024 | 1.13 | 1.65 | 0.91 |
| 2023 | 1.29 | 1.58 | 1.04 |
| 2022 | 1.27 | 1.65 | 1.01 |
| 2021 | 1.06 | 1.3 | 0.92 |
| 2020 | 0.99 | 1.39 | 0.8 |
| 2019 | 1.21 | 1.84 | 0.94 |
| 2018 | 1.45 | 1.93 | 1.12 |
| 2017 | 2.14 | 2.88 | 1.75 |
| 2016 | 17.01 | 65.08 | 1.86 |
| 2015 | 35.65 | 60.34 | 24.57 |
| 2014 | 34.34 | 35.3 | 30.15 |
| 2013 | 45.5 | 67.93 | 35.3 |
| 2012 | 67.93 | 67.93 | 67.93 |
| 2011 | 0 | -16.81 | |
| 2010 | 0 | -12.23 | |
| 2009 | 0 | -3.61 | |
| 2008 | 0 | -3.08 | |
| 2007 | 0 | -1.5 | |
| 2006 | 0 | -0.82 | |
| 2005 | 0 | -0.44 | |
| 2004 | 0 | -1.07 | |
| 2003 | 0 | -2.27 | |
| 2002 | 1.97 | 2.87 | 1.1 |
| 2001 | 12.07 | 17.83 | 1.85 |
| 2000 | 13.65 | 20.61 | 4.71 |
| 1999 | 6.32 | 8.3 | 5.16 |
| 1998 | 6.14 | 9.15 | 3.93 |
| 1997 | 6.47 | 9.21 | 3.73 |