| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.63 | 1.82 | 1.43 |
| 2024 | 1.58 | 2.23 | 1.13 |
| 2023 | 1.98 | 2.19 | 1.62 |
| 2022 | 2.07 | 2.65 | 1.66 |
| 2021 | 1.93 | 3.13 | 1.12 |
| 2020 | 1.35 | 2.33 | 1.14 |
| 2019 | 1.67 | 2.07 | 1.35 |
| 2018 | 1.97 | 2.6 | 1.51 |
| 2017 | 3.03 | 3.86 | 2.4 |
| 2016 | 3.62 | 4.78 | 3.04 |
| 2015 | 5.55 | 7.82 | 3.42 |
| 2014 | 4.48 | 7.25 | 3.28 |
| 2013 | 4.42 | 5.3 | 3.71 |
| 2012 | 0 | -19.2 | |
| 2011 | 210.25 | 242.15 | 181.67 |
| 2010 | 192.29 | 271.58 | 91.07 |
| 2009 | 63.37 | 121.42 | 41.28 |
| 2008 | 57.51 | 84.47 | 22.37 |
| 2007 | 75.79 | 629.12 | 23.17 |
| 2006 | 13.05 | 25.76 | 2.13 |
| 2005 | 2.59 | 3.94 | 1.55 |
| 2004 | 4.43 | 5.99 | 3.39 |
| 2003 | 6.28 | 7.91 | 4.25 |
| 2002 | 7.5 | 8.97 | 4.53 |
| 2001 | 9.22 | 11.68 | 6.67 |
| 2000 | 8.19 | 10.97 | 4.85 |
| 1999 | 3.48 | 4.91 | 2.39 |
| 1998 | 3.21 | 4.1 | 2.55 |
| 1997 | 2.71 | 4.05 | 1.94 |