| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.93 | 2.14 | 1.69 |
| 2024 | 2.29 | 3.45 | 1.43 |
| 2023 | 3.91 | 5.71 | 2.83 |
| 2022 | 6.72 | 10.06 | 4.21 |
| 2021 | 6.78 | 12.63 | 2.93 |
| 2020 | 1.73 | 2.86 | 1.3 |
| 2019 | 1.63 | 2.27 | 1.32 |
| 2018 | 2.32 | 3.32 | 1.39 |
| 2017 | 2.85 | 3.24 | 2.66 |
| 2016 | 0 | -2.69 | |
| 2015 | 11.49 | 15.63 | 8.53 |
| 2014 | 4.6 | 10.5 | 1.31 |
| 2013 | 1.55 | 1.98 | 1.24 |
| 2012 | 1.43 | 1.66 | 1.19 |
| 2011 | 2.01 | 2.83 | 1.34 |
| 2010 | 1.96 | 2.5 | 1.45 |
| 2009 | 2.18 | 2.8 | 1.54 |
| 2008 | 3.1 | 4.96 | 1.08 |
| 2007 | 2.75 | 4.41 | 1.25 |
| 2006 | 1.41 | 1.81 | 1.16 |
| 2005 | 1.46 | 1.85 | 1.21 |
| 2004 | 1.64 | 2.31 | 1.19 |
| 2003 | 2.05 | 2.32 | 1.78 |
| 2002 | 2.5 | 2.82 | 1.84 |
| 2001 | 3.42 | 4.21 | 2.48 |