| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.19 | 1.44 | 1.06 |
| 2024 | 1.07 | 1.6 | 0.73 |
| 2023 | 1.29 | 1.47 | 1.15 |
| 2022 | 1.55 | 2.07 | 1.16 |
| 2021 | 1.6 | 3.18 | 1.1 |
| 2020 | 1.07 | 1.27 | 0.95 |
| 2019 | 1.33 | 2.03 | 0.94 |
| 2018 | 1.37 | 1.84 | 1.08 |
| 2017 | 1.55 | 1.9 | 1.23 |
| 2016 | 1.36 | 1.79 | 1.16 |
| 2015 | 1.74 | 2.95 | 1.11 |
| 2014 | 1.65 | 1.97 | 1.41 |
| 2013 | 2.98 | 3.78 | 1.93 |
| 2012 | 0 | -7.35 | |
| 2011 | 0 | -7.54 | |
| 2010 | 0 | -5.68 | |
| 2009 | 0 | -23.94 | |
| 2008 | 0 | -19.99 | |
| 2007 | 0 | -11.5 | |
| 2006 | 23.87 | 42.54 | 7.12 |
| 2005 | 9.75 | 25.35 | 4.21 |
| 2004 | 15.25 | 32.58 | 5.72 |
| 2003 | 7.42 | 8.84 | 5.1 |
| 2002 | 8.9 | 10.41 | 5.88 |
| 2001 | 10.97 | 13.25 | 7.83 |
| 2000 | 10.42 | 13 | 7.63 |
| 1999 | 5.85 | 8.6 | 4.12 |
| 1998 | 4.08 | 6 | 2.54 |
| 1997 | 2.52 | 3.57 | 1.94 |