| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.23 | 4.15 | 2.21 |
| 2024 | 2.12 | 2.77 | 1.62 |
| 2023 | 2.47 | 3.06 | 2.07 |
| 2022 | 1.86 | 2.56 | 1.37 |
| 2021 | 2.39 | 3.26 | 1.67 |
| 2020 | 3.74 | 5.26 | 2.89 |
| 2019 | 2.45 | 3.42 | 1.86 |
| 2018 | 3.44 | 4.81 | 2.26 |
| 2017 | 5.3 | 6.25 | 4.01 |
| 2016 | 28.51 | 97.76 | 4.42 |
| 2015 | 22.48 | 52.07 | 13.97 |
| 2014 | 15.9 | 20.54 | 13.25 |
| 2013 | 16.55 | 19.34 | 14.44 |
| 2012 | 19.94 | 26.47 | 14.65 |
| 2011 | 41.74 | 82.28 | 16.83 |
| 2010 | 81.62 | 92.07 | 72.13 |
| 2009 | 0 | -0.77 | |
| 2008 | 0 | -0.53 | |
| 2007 | 0 | -1.77 | |
| 2006 | 0 | -0.98 | |
| 2005 | 19.98 | 25.51 | 12.44 |
| 2004 | 12.21 | 29.23 | 4.76 |
| 2003 | 9.29 | 12.02 | 5.86 |
| 2002 | 9.95 | 11.66 | 6.91 |
| 2001 | 15.12 | 20.66 | 9.58 |
| 2000 | 66.1 | 85.41 | 47.57 |
| 1999 | 58.48 | 92.5 | 30.12 |
| 1998 | 3.62 | 4.31 | 3.04 |
| 1997 | 4.08 | 5.97 | 2.44 |