| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.23 | 1.36 | 1.16 |
| 2024 | 1.45 | 2.09 | 1.06 |
| 2023 | 2.28 | 3.17 | 1.8 |
| 2022 | 2.5 | 2.98 | 2.02 |
| 2021 | 2.39 | 3.12 | 1.84 |
| 2020 | 3.09 | 4.58 | 2.13 |
| 2019 | 2.15 | 3.51 | 1.34 |
| 2018 | 1.92 | 2.51 | 1.35 |
| 2017 | 2.18 | 2.43 | 1.92 |
| 2016 | 2.11 | 2.65 | 1.36 |
| 2015 | 2.12 | 3.66 | 1.6 |
| 2014 | 1.7 | 2.05 | 1.42 |
| 2013 | 1.67 | 2.04 | 1.37 |
| 2012 | 2.14 | 2.77 | 1.33 |
| 2011 | 3.26 | 3.98 | 2.47 |
| 2010 | 4.32 | 5.16 | 3.48 |
| 2009 | 4.07 | 5.04 | 2.6 |
| 2008 | 3.96 | 8.57 | 1.66 |
| 2007 | 5.98 | 9.46 | 2.84 |
| 2006 | 1.68 | 2.84 | 0.8 |
| 2005 | 1.1 | 1.45 | 0.83 |
| 2004 | 1.55 | 2.51 | 0.98 |