| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.11 | 1.3 | 1.03 |
| 2024 | 1.69 | 2.94 | 1.01 |
| 2023 | 1.47 | 2.66 | 1.08 |
| 2022 | 1.22 | 1.57 | 1.07 |
| 2021 | 1.02 | 1.81 | 0.67 |
| 2020 | 0.92 | 1.31 | 0.76 |
| 2019 | 1.38 | 2.18 | 1 |
| 2018 | 1.6 | 2.02 | 1.01 |
| 2017 | 2.71 | 4.38 | 1.7 |
| 2016 | 3.68 | 4.58 | 3.28 |
| 2015 | 5.37 | 12.21 | 2.57 |
| 2014 | 5.93 | 7.69 | 4.39 |
| 2013 | 2.72 | 4.77 | 2.04 |
| 2012 | 3.44 | 5.01 | 2.33 |
| 2011 | 4.12 | 5.7 | 3.31 |
| 2010 | 4.39 | 6.41 | 3.22 |
| 2009 | 3.23 | 4.81 | 2.01 |
| 2008 | 3.53 | 8.04 | 1.53 |
| 2007 | 0 | -2.83 | |
| 2006 | 0 | -1.7 | |
| 2005 | 0 | -2.08 | |
| 2004 | 0 | -3.92 | |
| 2003 | 0 | -2.5 | |
| 2002 | 0 | -1.91 | |
| 2001 | 0 | -2.31 | |
| 2000 | 0 | -2.51 | |
| 1999 | 7.89 | 10.16 | 5.24 |
| 1998 | 4.79 | 6.23 | 3.49 |
| 1997 | 4.86 | 5.92 | 3.45 |