| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.22 | 0.27 | 0.2 |
| 2024 | 0.15 | 0.29 | 0.1 |
| 2023 | 0.2 | 0.27 | 0.13 |
| 2022 | 0.22 | 0.32 | 0.18 |
| 2021 | 0.28 | 0.37 | 0.19 |
| 2020 | 0.38 | 0.46 | 0.33 |
| 2019 | 0.5 | 0.67 | 0.39 |
| 2018 | 0.59 | 1.03 | 0.37 |
| 2017 | 1.01 | 1.24 | 0.86 |
| 2016 | 1.11 | 1.43 | 0.88 |
| 2015 | 1.38 | 2.11 | 1.03 |
| 2014 | 0.7 | 1.11 | 0.59 |
| 2013 | 1.08 | 1.74 | 0.72 |
| 2012 | 1.98 | 3.43 | 1.24 |
| 2011 | 2.58 | 3.13 | 1.89 |
| 2010 | 3.06 | 4.87 | 2.14 |
| 2009 | 3.14 | 5.52 | 0.53 |
| 2008 | 182.85 | 987.89 | 0.36 |
| 2007 | 168.28 | 379.87 | 7.78 |
| 2006 | 3.81 | 9.06 | 0.98 |
| 2005 | 1.22 | 1.64 | 0.97 |
| 2004 | 2.61 | 4.73 | 1.44 |