| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.8 | 0.9 | 0.71 |
| 2024 | 0.81 | 1.06 | 0.65 |
| 2023 | 0.94 | 1.18 | 0.71 |
| 2022 | 0.92 | 1.12 | 0.71 |
| 2021 | 1.18 | 1.51 | 1 |
| 2020 | 1.49 | 1.84 | 1.28 |
| 2019 | 1.44 | 2.15 | 0.83 |
| 2018 | 0.96 | 1.38 | 0.68 |
| 2017 | 2.01 | 3.87 | 1.17 |
| 2016 | 19.9 | 62.38 | 2.21 |
| 2015 | 252.46 | 764.9 | 17.23 |
| 2014 | 127.52 | 535.7 | 23.54 |
| 2013 | 0 | -1.81 | |
| 2012 | 0 | -0.57 | |
| 2011 | 0 | -0.55 | |
| 2010 | 0 | -0.58 | |
| 2009 | 5.36 | 6.83 | 3.64 |
| 2008 | 5.95 | 8.98 | 3.1 |
| 2007 | 1.42 | 2.05 | 1.08 |
| 2006 | 1.17 | 1.39 | 0.94 |
| 2005 | 1.42 | 1.85 | 1.13 |
| 2004 | 2.34 | 3.73 | 1.75 |
| 2003 | 3.6 | 4.32 | 2.65 |
| 2002 | 4.83 | 5.55 | 3.48 |
| 2001 | 5.87 | 7.19 | 4.14 |
| 2000 | 8.24 | 9.98 | 6.78 |
| 1999 | 6.35 | 8.72 | 4.54 |