| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.23 | 1.96 | 0.97 |
| 2024 | 1.1 | 1.33 | 0.87 |
| 2023 | 1.88 | 3.14 | 1.25 |
| 2022 | 2.37 | 3.11 | 1.43 |
| 2021 | 2.29 | 3.65 | 1.69 |
| 2020 | 2.25 | 2.92 | 1.82 |
| 2019 | 1.82 | 2.34 | 1.42 |
| 2018 | 1.8 | 2.47 | 1.28 |
| 2017 | 2.27 | 2.69 | 1.79 |
| 2016 | 2.94 | 3.27 | 2.11 |
| 2015 | 4.33 | 10.05 | 1.93 |
| 2014 | 5.05 | 6.65 | 4.07 |
| 2013 | 2.96 | 4.97 | 2.17 |
| 2012 | 3.05 | 4.07 | 2.01 |
| 2011 | 5.52 | 7.73 | 3.03 |
| 2010 | 4.51 | 8.69 | 2.44 |
| 2009 | 1.95 | 2.69 | 1.07 |
| 2008 | 2.36 | 5.56 | 0.85 |
| 2007 | 3.96 | 5.31 | 2.48 |
| 2006 | 2.47 | 3.17 | 1.47 |
| 2005 | 1.93 | 3.29 | 0.96 |
| 2004 | 3.85 | 5.31 | 2.1 |
| 2003 | 4.85 | 5.87 | 3.87 |
| 2002 | 5.32 | 6.73 | 4.02 |