| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.17 | 1.28 | 1.05 |
| 2024 | 0.96 | 1.32 | 0.86 |
| 2023 | 1.33 | 1.69 | 1.05 |
| 2022 | 2.09 | 2.87 | 1.55 |
| 2021 | 2.82 | 3.47 | 2.36 |
| 2020 | 2.7 | 3.1 | 2.16 |
| 2019 | 2.47 | 4.15 | 1.06 |
| 2018 | 5.42 | 10.75 | 2.69 |
| 2017 | 7.73 | 9.55 | 6.22 |
| 2016 | 7.37 | 8.43 | 6.8 |
| 2015 | 285.81 | 476.48 | 74.53 |
| 2014 | 21.36 | 75.95 | 5.98 |
| 2013 | 8.08 | 12.54 | 5.73 |
| 2012 | 8.07 | 13.19 | 3.44 |
| 2011 | 7.77 | 10.88 | 3.52 |
| 2010 | 3.55 | 4.2 | 2.78 |
| 2009 | 2.89 | 3.83 | 1.56 |
| 2008 | 2.91 | 4.87 | 1.18 |
| 2007 | 3.02 | 4.91 | 1.43 |
| 2006 | 1.39 | 1.96 | 1.01 |
| 2005 | 1.29 | 1.79 | 0.88 |
| 2004 | 2.27 | 3.11 | 1.68 |
| 2003 | 2.35 | 2.74 | 2.06 |
| 2002 | 2.86 | 3.39 | 2.14 |
| 2001 | 3.83 | 4.3 | 3.35 |
| 2000 | 3.21 | 3.94 | 2.51 |
| 1999 | 2.48 | 3.13 | 1.97 |