| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 2.52 | 2.81 | 2.32 |
| 2025 | 2.49 | 2.63 | 2.29 |
| 2024 | 2.31 | 2.78 | 2.01 |
| 2023 | 2.26 | 2.46 | 2.09 |
| 2022 | 0 | -0.53 | |
| 2021 | 4.7 | 19.6 | 1.38 |
| 2020 | 1.4 | 1.93 | 1.05 |
| 2019 | 1.47 | 2.22 | 0.96 |
| 2018 | 1.74 | 2.31 | 1.34 |
| 2017 | 1.84 | 2.01 | 1.61 |
| 2016 | 1.92 | 2.23 | 1.76 |
| 2015 | 2.17 | 3.06 | 1.6 |
| 2014 | 1.32 | 1.68 | 1.05 |
| 2013 | 1.24 | 1.38 | 1.08 |
| 2012 | 1.02 | 1.24 | 0.78 |
| 2011 | 1.4 | 1.74 | 1.08 |
| 2010 | 1.35 | 1.78 | 0.95 |
| 2009 | 0.96 | 1.75 | 0.61 |
| 2008 | 1.06 | 2.18 | 0.52 |
| 2007 | 1.78 | 3.21 | 0.79 |
| 2006 | 0.71 | 0.83 | 0.57 |
| 2005 | 0.14 | 0.57 | 0.02 |
| 2004 | 0.07 | 0.1 | 0.04 |
| 2003 | 0.08 | 0.09 | 0.07 |
| 2002 | 0.09 | 0.11 | 0.08 |
| 2001 | 0.11 | 0.17 | 0.05 |
| 2000 | 0.06 | 0.09 | 0.04 |
| 1999 | 0.05 | 0.09 | 0.04 |
| 1998 | 0.08 | 0.11 | 0.05 |
| 1997 | 0.13 | 0.25 | 0.09 |