| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.7 | 2.1 | 1.55 |
| 2024 | 1.26 | 2.94 | 0.89 |
| 2023 | 1.24 | 1.38 | 1.11 |
| 2022 | 1.42 | 1.74 | 1.19 |
| 2021 | 1.43 | 1.85 | 1.27 |
| 2020 | 3.7 | 10.72 | 1.37 |
| 2019 | 2.28 | 4.18 | 1.37 |
| 2018 | 1.67 | 2.32 | 1.24 |
| 2017 | 3.11 | 4.56 | 2.07 |
| 2016 | 4.34 | 10.51 | 2.92 |
| 2015 | 12.47 | 21.23 | 7.82 |
| 2014 | 6.04 | 9.12 | 3.43 |
| 2013 | 0 | -1.22 | |
| 2012 | 0 | -1.14 | |
| 2011 | 0 | -1.47 | |
| 2010 | 0 | -2.46 | |
| 2009 | 1.76 | 2.43 | 1.06 |
| 2008 | 1.92 | 3.79 | 0.83 |
| 2007 | 2.29 | 4.72 | 0.79 |
| 2006 | 0.83 | 1.1 | 0.66 |
| 2005 | 0.81 | 1.11 | 0.59 |
| 2004 | 1.59 | 2.11 | 1.12 |
| 2003 | 2.05 | 2.51 | 1.63 |
| 2002 | 3.25 | 5.46 | 1.91 |
| 2001 | 5.7 | 6.89 | 4.71 |
| 2000 | 5.7 | 6.51 | 4.64 |