| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3 | 4.17 | 2.15 |
| 2023 | 2.52 | 3.2 | 1.77 |
| 2022 | 1.65 | 2.26 | 1.27 |
| 2021 | 1.99 | 2.58 | 1.51 |
| 2020 | 1.94 | 2.51 | 1.4 |
| 2019 | 2.05 | 2.85 | 1.35 |
| 2018 | 2.11 | 3.53 | 1.3 |
| 2017 | 3.67 | 4.81 | 2.89 |
| 2016 | 2.92 | 4.18 | 2.28 |
| 2015 | 3.78 | 5.73 | 2.38 |
| 2014 | 4.16 | 6.04 | 3.21 |
| 2013 | 6.26 | 8.16 | 4.71 |
| 2012 | 5.75 | 7.17 | 4.22 |
| 2011 | 15.25 | 29.74 | 5.64 |
| 2010 | 31.16 | 40.13 | 24.68 |
| 2009 | 0 | -3.35 | |
| 2008 | 0 | -3.03 | |
| 2007 | 0 | -2.27 | |
| 2006 | 1.86 | 2.09 | 1.55 |
| 2005 | 0.79 | 1.9 | 0.32 |
| 2004 | 1.21 | 1.72 | 0.79 |
| 2003 | 1.58 | 1.96 | 1.25 |
| 2002 | 1.97 | 2.67 | 1.47 |
| 2001 | 1.77 | 2.03 | 1.37 |
| 2000 | 2.12 | 2.51 | 1.68 |