| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.79 | 2.19 | 1.61 |
| 2024 | 1.64 | 2.32 | 1.23 |
| 2023 | 1.46 | 1.82 | 1.33 |
| 2022 | 1.55 | 2.47 | 1.06 |
| 2021 | 1.85 | 2.44 | 1.57 |
| 2020 | 1.32 | 2.75 | 1.01 |
| 2019 | 1.32 | 2.15 | 1.02 |
| 2018 | 1.28 | 1.81 | 0.91 |
| 2017 | 1.93 | 2.26 | 1.68 |
| 2016 | 2.22 | 2.83 | 1.78 |
| 2015 | 2.86 | 4.88 | 1.8 |
| 2014 | 1.29 | 2.18 | 0.91 |
| 2013 | 1.01 | 1.26 | 0.91 |
| 2012 | 1.04 | 1.35 | 0.87 |
| 2011 | 1.47 | 1.85 | 1.04 |
| 2010 | 2.04 | 2.6 | 1.57 |
| 2009 | 1.86 | 2.76 | 1.12 |
| 2008 | 1.84 | 3.7 | 0.91 |
| 2007 | 2.98 | 4.24 | 1.44 |
| 2006 | 1.46 | 1.88 | 1.13 |
| 2005 | 1.31 | 1.62 | 1.12 |
| 2004 | 2.58 | 4.06 | 1.2 |
| 2003 | 3.69 | 4.27 | 3.17 |
| 2002 | 4.18 | 4.7 | 3.62 |
| 2001 | 3.79 | 4.45 | 2.96 |
| 2000 | 2.44 | 2.96 | 1.88 |