| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.54 | 1.7 | 1.44 |
| 2024 | 1.54 | 1.98 | 1.09 |
| 2023 | 2.06 | 2.79 | 1.58 |
| 2022 | 2.18 | 3.21 | 1.71 |
| 2021 | 1.73 | 2.03 | 1.54 |
| 2020 | 2.23 | 3.23 | 1.76 |
| 2019 | 2.45 | 3.46 | 1.94 |
| 2018 | 3.12 | 4.64 | 2.37 |
| 2017 | 4.72 | 6.32 | 2.93 |
| 2016 | 5.71 | 6.9 | 4.46 |
| 2015 | 6.26 | 11.23 | 3.86 |
| 2014 | 3.79 | 5.53 | 2.77 |
| 2013 | 3.44 | 4.33 | 2.49 |
| 2012 | 2.77 | 3.89 | 1.75 |
| 2011 | 3.14 | 4.3 | 1.84 |
| 2010 | 4.82 | 6.74 | 3.62 |
| 2009 | 7.42 | 9.84 | 4.78 |
| 2008 | 5.51 | 7.83 | 2.82 |
| 2007 | 6.13 | 10.22 | 2.74 |
| 2006 | 2.26 | 3.01 | 1.53 |
| 2005 | 1.77 | 2.14 | 1.4 |
| 2004 | 2.53 | 3.57 | 1.83 |
| 2003 | 3.58 | 5.12 | 2.48 |
| 2002 | 5.67 | 6.92 | 4.2 |
| 2001 | 0 | -25.54 | |
| 2000 | 0 | -8.8 | |
| 1999 | 10.28 | 12.47 | 8.23 |
| 1998 | 6.76 | 9.3 | 4.68 |
| 1997 | 5.51 | 9.47 | 3.7 |