| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.82 | 3.42 | 1.12 |
| 2024 | 0.97 | 1.8 | 0.69 |
| 2023 | 1.52 | 1.96 | 1.28 |
| 2022 | 1.25 | 1.58 | 0.97 |
| 2021 | 0.9 | 1.41 | 0.75 |
| 2020 | 1.01 | 1.18 | 0.79 |
| 2019 | 1.11 | 1.7 | 0.88 |
| 2018 | 1.15 | 1.34 | 0.94 |
| 2017 | 1.57 | 1.98 | 1.29 |
| 2016 | 1.34 | 1.59 | 1.11 |
| 2015 | 1.7 | 3.22 | 0.89 |
| 2014 | 0.71 | 1.19 | 0.48 |
| 2013 | 0.63 | 0.72 | 0.52 |
| 2012 | 0.75 | 1.02 | 0.52 |
| 2011 | 1.24 | 1.8 | 0.82 |
| 2010 | 1.98 | 3.27 | 1.44 |
| 2009 | 2.1 | 2.64 | 1.47 |
| 2008 | 6 | 19.16 | 1.17 |
| 2007 | 6.74 | 17.01 | 1.06 |
| 2006 | 1.41 | 2.28 | 0.92 |
| 2005 | 2.68 | 5.83 | 1.12 |
| 2004 | 8.88 | 16.47 | 5.41 |