| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 1.22 | 1.29 | 1.16 |
| 2025 | 1.16 | 1.31 | 1.07 |
| 2024 | 1.18 | 1.36 | 1.03 |
| 2023 | 1.16 | 1.29 | 0.99 |
| 2022 | 1.07 | 1.43 | 0.86 |
| 2021 | 1.92 | 2.48 | 1.33 |
| 2020 | 1.79 | 2.34 | 1.42 |
| 2019 | 1.48 | 1.94 | 1.04 |
| 2018 | 1.66 | 2.76 | 1.05 |
| 2017 | 1.83 | 2.77 | 1.4 |
| 2016 | 1.13 | 1.35 | 1 |
| 2015 | 1.68 | 2.63 | 1.26 |
| 2014 | 1.26 | 3.03 | 1.01 |
| 2013 | 1.19 | 1.42 | 1.01 |
| 2012 | 1.06 | 1.24 | 0.91 |
| 2011 | 1.56 | 2.31 | 1 |
| 2010 | 1.87 | 2.72 | 1.32 |
| 2009 | 3.48 | 9.68 | 1.32 |
| 2008 | 4.57 | 11.12 | 0.92 |
| 2007 | 5.9 | 9.77 | 2.11 |
| 2006 | 2.34 | 4.19 | 1.31 |
| 2005 | 0.92 | 1.87 | 0.5 |
| 2004 | 2.35 | 5.15 | 0.83 |
| 2003 | 3.05 | 3.89 | 2.22 |
| 2002 | 2.88 | 3.28 | 2.23 |