| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.67 | 1.15 | 0.47 |
| 2024 | 0.55 | 0.76 | 0.44 |
| 2023 | 0.53 | 0.82 | 0.38 |
| 2022 | 0.63 | 0.9 | 0.51 |
| 2021 | 0.81 | 1.08 | 0.65 |
| 2020 | 0.58 | 0.84 | 0.49 |
| 2019 | 0.63 | 0.92 | 0.51 |
| 2018 | 0.73 | 1 | 0.51 |
| 2017 | 1.51 | 2.32 | 0.93 |
| 2016 | 1.72 | 2.37 | 1.23 |
| 2015 | 1.54 | 2.38 | 0.99 |
| 2014 | 0.89 | 1.74 | 0.61 |
| 2013 | 0.59 | 0.73 | 0.46 |
| 2012 | 0.71 | 1.28 | 0.44 |
| 2011 | 1.6 | 4.53 | 0.85 |
| 2010 | 1.27 | 1.64 | 0.89 |
| 2009 | 0.73 | 1.55 | 0.43 |
| 2008 | 1.58 | 2.03 | 0.42 |
| 2007 | 1.21 | 1.68 | 0.75 |
| 2006 | 1.22 | 1.58 | 0.81 |
| 2005 | 0.87 | 1.06 | 0.7 |
| 2004 | 1.6 | 2.37 | 1 |
| 2003 | 0 | 0 | |
| 2002 | 13.56 | 16.25 | 11.11 |