| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.33 | 1.45 | 1.21 |
| 2024 | 1.28 | 1.69 | 0.98 |
| 2023 | 1.29 | 1.55 | 1.08 |
| 2022 | 1.04 | 1.54 | 0.88 |
| 2021 | 0.99 | 1.26 | 0.81 |
| 2020 | 1.41 | 1.73 | 1.16 |
| 2019 | 1.42 | 2.01 | 1.09 |
| 2018 | 1.53 | 2.1 | 1.03 |
| 2017 | 2.66 | 3.66 | 1.91 |
| 2016 | 2.83 | 3.76 | 2.14 |
| 2015 | 3.94 | 5.96 | 2.57 |
| 2014 | 2.49 | 3.22 | 2 |
| 2013 | 2.27 | 3.09 | 1.65 |
| 2012 | 2.98 | 3.59 | 2.36 |
| 2011 | 3.18 | 4.03 | 2.57 |
| 2010 | 4.08 | 6.23 | 2.86 |
| 2009 | 6.42 | 9.14 | 5.23 |
| 2008 | 0 | ||
| 2007 | 0 | ||
| 2006 | 2.41 | 2.93 | 1.12 |
| 2005 | 2 | 3.83 | 0.62 |
| 2004 | 1.87 | 3.41 | 1.18 |