| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.79 | 4.22 | 1.77 |
| 2024 | 1.64 | 2.61 | 1.17 |
| 2023 | 1.73 | 2.01 | 1.4 |
| 2022 | 1.48 | 2.3 | 1.12 |
| 2021 | 1.69 | 1.92 | 1.5 |
| 2020 | 2.58 | 3.25 | 1.83 |
| 2019 | 2.76 | 3.58 | 2.07 |
| 2018 | 3.04 | 4.48 | 2 |
| 2017 | 3.24 | 4.64 | 2.5 |
| 2016 | 2.64 | 3.77 | 1.54 |
| 2015 | 2.09 | 4.63 | 1.19 |
| 2014 | 1.14 | 1.42 | 0.86 |
| 2013 | 0.94 | 1.36 | 0.69 |
| 2012 | 0.7 | 0.81 | 0.58 |
| 2011 | 0.98 | 1.21 | 0.7 |
| 2010 | 1.19 | 1.53 | 1.01 |
| 2009 | 0.87 | 1.32 | 0.48 |
| 2008 | 1.07 | 2.12 | 0.39 |
| 2007 | 1.62 | 2.38 | 1.15 |
| 2006 | 0.69 | 1.15 | 0.53 |
| 2005 | 0.7 | 0.88 | 0.49 |
| 2004 | 1.08 | 2.54 | 0.59 |