| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.48 | 1.71 | 1.25 |
| 2024 | 1.22 | 1.56 | 0.94 |
| 2023 | 1.42 | 1.58 | 1.28 |
| 2022 | 1.41 | 1.69 | 1.18 |
| 2021 | 1.4 | 1.83 | 1.21 |
| 2020 | 1.37 | 1.64 | 1.15 |
| 2019 | 1.55 | 2.35 | 1.18 |
| 2018 | 1.54 | 2.84 | 1 |
| 2017 | 2.39 | 3.18 | 1.76 |
| 2016 | 3.34 | 4.36 | 2.3 |
| 2015 | 2.68 | 5.19 | 1.62 |
| 2014 | 1.56 | 2.02 | 1.19 |
| 2013 | 1.81 | 2.42 | 1.43 |
| 2012 | 1.68 | 2.03 | 1.44 |
| 2011 | 2.06 | 2.5 | 1.43 |
| 2010 | 2.43 | 3.15 | 1.83 |
| 2009 | 1.77 | 2.72 | 1.01 |
| 2008 | 1.71 | 3.04 | 0.82 |
| 2007 | 2.15 | 3.38 | 1.14 |
| 2006 | 1.25 | 1.45 | 0.98 |
| 2005 | 1.62 | 2 | 1.26 |
| 2004 | 3.19 | 5.94 | 1.93 |
| 2003 | 6.14 | 8.17 | 3.13 |
| 2002 | 6.21 | 7.88 | 4.89 |
| 2001 | 5.27 | 5.94 | 4.66 |