| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.5 | 1.8 | 1.37 |
| 2024 | 1.48 | 1.89 | 1.09 |
| 2023 | 1.68 | 2.02 | 1.36 |
| 2022 | 2.61 | 3.43 | 1.78 |
| 2021 | 2.7 | 4.62 | 1.87 |
| 2020 | 2.03 | 2.96 | 1.57 |
| 2019 | 2.05 | 2.98 | 1.65 |
| 2018 | 2.05 | 2.67 | 1.48 |
| 2017 | 3.06 | 3.93 | 2.28 |
| 2016 | 3.79 | 4.9 | 3.4 |
| 2015 | 2202.34 | 9079.45 | 3.71 |
| 2014 | 5.56 | 14.97 | 2.11 |
| 2013 | 2.54 | 3.53 | 2.04 |
| 2012 | 2.55 | 3.75 | 1.67 |
| 2011 | 2.42 | 3.23 | 1.85 |
| 2010 | 1.96 | 2.44 | 1.58 |
| 2009 | 1.54 | 2.08 | 0.9 |
| 2008 | 1.64 | 3.64 | 0.76 |
| 2007 | 1.79 | 2.69 | 0.87 |
| 2006 | 0.86 | 0.99 | 0.75 |
| 2005 | 0.84 | 1.11 | 0.65 |
| 2004 | 1.26 | 1.7 | 0.95 |
| 2003 | 1.62 | 1.99 | 1.24 |
| 2002 | 2.3 | 2.63 | 1.9 |
| 2001 | 3.41 | 4.16 | 2.41 |
| 2000 | 4.44 | 5.32 | 3.49 |
| 1999 | 3.03 | 3.96 | 2.34 |