| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.64 | 0.78 | 0.56 |
| 2024 | 0.64 | 0.77 | 0.47 |
| 2023 | 1.08 | 1.51 | 0.71 |
| 2022 | 1.21 | 1.58 | 1.01 |
| 2021 | 1.01 | 1.29 | 0.8 |
| 2020 | 0.92 | 1.25 | 0.61 |
| 2019 | 0.78 | 1 | 0.66 |
| 2018 | 1.08 | 1.46 | 0.75 |
| 2017 | 1.6 | 2.15 | 1.04 |
| 2016 | 2.36 | 3.56 | 1.85 |
| 2015 | 4.44 | 9.95 | 2.04 |
| 2014 | 3.76 | 6.28 | 2.64 |
| 2013 | 2.69 | 3.85 | 1.96 |
| 2012 | 3.12 | 4.36 | 2.27 |
| 2011 | 2948.68 | 8290.02 | 3.03 |
| 2010 | 0 | ||
| 2009 | 0 | -1.07 | |
| 2008 | 13.2 | 15.98 | 8.33 |
| 2007 | 6.99 | 14.52 | 2.68 |
| 2006 | 2.16 | 3.17 | 0.88 |
| 2005 | 1.41 | 2.28 | 0.98 |
| 2004 | 3.17 | 6.06 | 1.85 |
| 2003 | 5.11 | 7.91 | 3.51 |
| 2002 | 8.58 | 12.09 | 4.77 |
| 2001 | 5.89 | 7.29 | 4.47 |
| 2000 | 6.66 | 8.6 | 5.9 |
| 1999 | 9.37 | 14.63 | 7.55 |
| 1998 | 8.8 | 15.63 | 4.42 |