| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.08 | 1.39 | 0.88 |
| 2024 | 0.87 | 1.31 | 0.69 |
| 2023 | 0.96 | 1.38 | 0.59 |
| 2022 | 0.69 | 0.94 | 0.55 |
| 2021 | 0.68 | 1.01 | 0.48 |
| 2020 | 0.45 | 0.63 | 0.25 |
| 2019 | 0.76 | 1.22 | 0.56 |
| 2018 | 1.35 | 2.21 | 0.72 |
| 2017 | 3.01 | 3.77 | 2.05 |
| 2016 | 3.05 | 3.88 | 2.68 |
| 2015 | 5.38 | 7.81 | 2.81 |
| 2014 | 4.02 | 5.24 | 3.22 |
| 2013 | 94 | 596.1 | 3.15 |
| 2012 | 162.73 | 496.18 | 93.66 |
| 2011 | 114.94 | 176.98 | 58.58 |
| 2010 | 46.51 | 76.6 | 21.36 |
| 2009 | 30.94 | 52.64 | 9.6 |
| 2008 | 9.48 | 12.58 | 7.04 |
| 2007 | 9.6 | 13.21 | 5.9 |
| 2006 | 6.27 | 7.13 | 5.16 |
| 2005 | 5.49 | 7.92 | 3.17 |
| 2004 | 11.91 | 22.95 | 6.2 |