| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 1.5 | 1.57 | 1.42 |
| 2025 | 1.36 | 2.2 | 1.1 |
| 2024 | 1.18 | 1.36 | 1.01 |
| 2023 | 1.36 | 1.57 | 1.19 |
| 2022 | 1.72 | 2.48 | 1.38 |
| 2021 | 2.52 | 3.27 | 2.05 |
| 2020 | 4.01 | 5.19 | 3.19 |
| 2019 | 3.56 | 4.47 | 2.07 |
| 2018 | 2.51 | 3.33 | 1.82 |
| 2017 | 5.12 | 7.37 | 2.93 |
| 2016 | 5.04 | 9.57 | 2.38 |
| 2015 | 4.31 | 4.87 | 2.92 |
| 2014 | 2.69 | 3.35 | 2.2 |
| 2013 | 2.94 | 3.35 | 2.49 |
| 2012 | 3.03 | 3.86 | 2.4 |
| 2011 | 4.07 | 5.72 | 2.58 |
| 2010 | 3.85 | 4.94 | 2.83 |
| 2009 | 3.93 | 5.05 | 2.22 |
| 2008 | 4.8 | 10.28 | 1.58 |
| 2007 | 5.63 | 9.07 | 2.49 |
| 2006 | 1.97 | 2.68 | 1.15 |
| 2005 | 1.5 | 2.16 | 1.07 |
| 2004 | 2.52 | 3.31 | 1.9 |
| 2003 | 3.28 | 4.55 | 2.44 |
| 2002 | 4.37 | 5.39 | 3.52 |
| 2001 | 5.06 | 5.57 | 3.41 |
| 2000 | 3.71 | 4.87 | 2.49 |