| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.78 | 6.62 | 4.99 |
| 2024 | 4.73 | 9.12 | 3.67 |
| 2023 | 4.4 | 5.51 | 3.73 |
| 2022 | 0 | -1.42 | |
| 2021 | 63.45 | 106.94 | 13.04 |
| 2020 | 12.6 | 19.55 | 6.47 |
| 2019 | 17.93 | 40.38 | 1.04 |
| 2018 | 1.5 | 2.41 | 1.12 |
| 2017 | 5.62 | 7.57 | 2.14 |
| 2016 | 9.77 | 12.73 | 7.5 |
| 2015 | 11.24 | 16.86 | 5.07 |
| 2014 | 4.69 | 5.83 | 3.44 |
| 2013 | 3.24 | 4.86 | 2.26 |
| 2012 | 2.66 | 3.45 | 2.05 |
| 2011 | 4.19 | 5.86 | 2.48 |
| 2010 | 4.33 | 5.19 | 3.27 |
| 2009 | 3.77 | 5.74 | 1.86 |
| 2008 | 2.73 | 4.12 | 1.48 |
| 2007 | 3.42 | 5.76 | 1.33 |
| 2006 | 1.34 | 1.6 | 1.2 |
| 2005 | 1.55 | 2.07 | 1.1 |
| 2004 | 2.17 | 2.86 | 1.5 |
| 2003 | 2.48 | 2.86 | 2.01 |
| 2002 | 3.75 | 6.04 | 2.83 |
| 2001 | 7.08 | 8.99 | 4.92 |
| 2000 | 8.06 | 10.35 | 5.98 |
| 1999 | 5.55 | 8.18 | 3.88 |
| 1998 | 4.33 | 5.17 | 3.38 |
| 1997 | 4.89 | 9.5 | 2.74 |