| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0 | ||
| 2024 | 0.08 | 0.1 | 0.04 |
| 2023 | 0.12 | 0.14 | 0.1 |
| 2022 | 0.12 | 0.16 | 0.1 |
| 2021 | 0.13 | 0.18 | 0.12 |
| 2020 | 0.18 | 0.22 | 0.15 |
| 2019 | 0.21 | 0.29 | 0.16 |
| 2018 | 0.31 | 0.42 | 0.19 |
| 2017 | 0.4 | 0.48 | 0.35 |
| 2016 | 0.63 | 1.19 | 0.39 |
| 2015 | 47.11 | 254.04 | 0.97 |
| 2014 | 7.65 | 15.19 | 4.45 |
| 2013 | 3.91 | 5.02 | 2.17 |
| 2012 | 2.22 | 2.86 | 1.88 |
| 2011 | 3.37 | 4.97 | 2 |
| 2010 | 2.69 | 4.52 | 1.89 |
| 2009 | 1.79 | 2.86 | 0.92 |
| 2008 | 1.31 | 2 | 0.69 |
| 2007 | 1.56 | 2.19 | 1.05 |
| 2006 | 1.36 | 1.77 | 1.02 |
| 2005 | 0.91 | 1.15 | 0.53 |
| 2004 | 0.96 | 1.56 | 0.61 |