| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 3.37 | 5.32 | 2.98 |
| 2025 | 1.55 | 3.85 | 0.29 |
| 2024 | 0.25 | 0.51 | 0.17 |
| 2023 | 0.34 | 0.51 | 0.29 |
| 2022 | 0.39 | 0.65 | 0.29 |
| 2021 | 0.55 | 0.74 | 0.4 |
| 2020 | 0.74 | 0.86 | 0.68 |
| 2019 | 0.86 | 1.04 | 0.76 |
| 2018 | 0.78 | 1.2 | 0.55 |
| 2017 | 1.27 | 1.57 | 0.96 |
| 2016 | 1.37 | 1.98 | 1.09 |
| 2015 | 1.92 | 3.47 | 1.02 |
| 2014 | 1.17 | 1.61 | 0.8 |
| 2013 | 1.64 | 2.33 | 1.29 |
| 2012 | 1.95 | 2.3 | 1.63 |
| 2011 | 3.09 | 4.69 | 1.67 |
| 2010 | 4.92 | 7.37 | 2.93 |
| 2009 | 4.2 | 9.03 | 2.66 |
| 2008 | 26.54 | 79.03 | 3.52 |
| 2007 | 28.11 | 44.32 | 8.41 |
| 2006 | 6.2 | 9.23 | 3.2 |
| 2005 | 2.08 | 3.27 | 1.18 |
| 2004 | 2.3 | 4.44 | 1.17 |