| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 1.06 | 1.27 | 0.98 |
| 2025 | 1.1 | 1.47 | 0.9 |
| 2024 | 1.13 | 1.8 | 0.75 |
| 2023 | 1.63 | 2.08 | 1.35 |
| 2022 | 1.65 | 2.54 | 1.3 |
| 2021 | 1.59 | 1.84 | 1.32 |
| 2020 | 2.15 | 2.93 | 1.77 |
| 2019 | 5.07 | 16.84 | 2.12 |
| 2018 | 7.41 | 8.87 | 4.93 |
| 2017 | 13.71 | 24.43 | 8.24 |
| 2016 | 21.38 | 28.6 | 13.58 |
| 2015 | 10.63 | 20.75 | 6.03 |
| 2014 | 6.14 | 8.3 | 4.89 |
| 2013 | 5.24 | 6.37 | 4.32 |
| 2012 | 5.4 | 7.28 | 3.54 |
| 2011 | 7.64 | 10.25 | 4.67 |
| 2010 | 5.62 | 6.96 | 4.36 |
| 2009 | 3.7 | 5.36 | 2.49 |
| 2008 | 3.77 | 6.89 | 2.12 |
| 2007 | 4.72 | 7.8 | 1.96 |
| 2006 | 1.55 | 2.14 | 0.96 |
| 2005 | 1.1 | 1.81 | 0.63 |
| 2004 | 1.57 | 1.86 | 1.2 |
| 2003 | 1.52 | 1.84 | 1.29 |
| 2002 | 1.78 | 2 | 1.26 |
| 2001 | 2.53 | 3.09 | 1.8 |
| 2000 | 3.02 | 3.67 | 1.67 |
| 1999 | 1.98 | 2.32 | 1.51 |
| 1998 | 2.87 | 3.48 | 2.08 |