| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.37 | 1.48 | 1.18 |
| 2024 | 1.23 | 1.77 | 0.82 |
| 2023 | 1.59 | 1.71 | 1.44 |
| 2022 | 1.7 | 2.59 | 1.29 |
| 2021 | 1.49 | 1.93 | 1.17 |
| 2020 | 1.33 | 1.66 | 1 |
| 2019 | 1.5 | 1.9 | 1.33 |
| 2018 | 1.79 | 2.46 | 1.37 |
| 2017 | 2.76 | 3.31 | 2.08 |
| 2016 | 3.96 | 6.73 | 3.04 |
| 2015 | 8.54 | 12.19 | 6.19 |
| 2014 | 7.54 | 11.87 | 5.93 |
| 2013 | 0 | -21.62 | |
| 2012 | 0 | -23.1 | |
| 2011 | 0 | -23.39 | |
| 2010 | 0 | -19.6 | |
| 2009 | 57.42 | 68.58 | 43.64 |
| 2008 | 61.68 | 118.79 | 31.17 |
| 2007 | 107.61 | 228.73 | 51.52 |
| 2006 | 50.13 | 73.87 | 30.32 |
| 2005 | 17.02 | 41.02 | 9.08 |
| 2004 | 10.07 | 16.31 | 3.03 |
| 2003 | 13.06 | 19.48 | 10.04 |
| 2002 | 7.87 | 9.39 | 5.75 |
| 2001 | 10.58 | 14.9 | 6.86 |
| 2000 | 8.4 | 12.72 | 5.94 |
| 1999 | 5.75 | 7.8 | 3.79 |
| 1998 | 4.56 | 5.96 | 3.28 |
| 1997 | 3.2 | 4.01 | 2.45 |