| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.19 | 1.27 | 1.07 |
| 2024 | 1.09 | 1.62 | 0.81 |
| 2023 | 1.07 | 1.28 | 0.95 |
| 2022 | 1.05 | 1.22 | 0.94 |
| 2021 | 1.3 | 1.75 | 1.13 |
| 2020 | 1.62 | 2.03 | 1.24 |
| 2019 | 1.6 | 2 | 1.35 |
| 2018 | 1.24 | 1.62 | 0.86 |
| 2017 | 1.8 | 2.13 | 1.46 |
| 2016 | 2.25 | 2.59 | 1.81 |
| 2015 | 4.94 | 7.42 | 2.31 |
| 2014 | 4.93 | 8.91 | 3.35 |
| 2013 | 7.98 | 9.66 | 5.89 |
| 2012 | 5.89 | 9.16 | 2.71 |
| 2011 | 7.25 | 55.24 | 2.91 |
| 2010 | 4.24 | 4.62 | 4.07 |
| 2009 | 4.21 | 4.62 | 3.04 |
| 2008 | 2.83 | 3.04 | 2.65 |
| 2007 | 2.43 | 2.65 | 2.08 |
| 2006 | 1.63 | 2.2 | 0.88 |
| 2005 | 1.11 | 1.36 | 0.79 |
| 2004 | 1.67 | 2.4 | 1.08 |
| 2003 | 2.18 | 2.95 | 1.75 |
| 2002 | 2.98 | 3.67 | 1.91 |
| 2001 | 4.11 | 5.25 | 2.85 |
| 2000 | 5.24 | 8.67 | 2.72 |
| 1999 | 3.42 | 4.46 | 2.65 |
| 1998 | 4.12 | 5.18 | 3.39 |