| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.7 | 2.5 | 1.15 |
| 2024 | 1.26 | 1.58 | 1.02 |
| 2023 | 1.7 | 2.34 | 1.16 |
| 2022 | 1.08 | 1.78 | 0.82 |
| 2021 | 1.14 | 1.33 | 1.01 |
| 2020 | 1.57 | 1.95 | 1.22 |
| 2019 | 1.55 | 2 | 1.24 |
| 2018 | 1.71 | 2.65 | 1.17 |
| 2017 | 3.53 | 5.55 | 2.33 |
| 2016 | 4.28 | 5.64 | 3.46 |
| 2015 | 6.29 | 9.08 | 4.07 |
| 2014 | 5.45 | 7.53 | 3.85 |
| 2013 | 8.84 | 21 | 5.24 |
| 2012 | 6.83 | 9.36 | 4.49 |
| 2011 | 23.75 | 67.45 | 6.65 |
| 2010 | 9.57 | 10.49 | 8.43 |
| 2009 | 9.27 | 12.67 | 5.22 |
| 2008 | 7.43 | 12.29 | 4.44 |
| 2007 | 10.57 | 17.09 | 5.84 |
| 2006 | 6.37 | 9.46 | 5.06 |
| 2005 | 4.89 | 6.84 | 3.46 |
| 2004 | 6.48 | 9.07 | 4.81 |
| 2003 | 9.26 | 11.98 | 5.97 |
| 2002 | 11.3 | 14.17 | 7.99 |
| 2001 | 0 | -4.45 | |
| 2000 | 462.81 | 991.37 | 42.99 |
| 1999 | 21.67 | 29.76 | 17.46 |
| 1998 | 17.39 | 28.33 | 7.81 |
| 1997 | 3.68 | 4.79 | 2.56 |