| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.09 | 1.3 | 0.94 |
| 2024 | 0.91 | 1.2 | 0.79 |
| 2023 | 1.06 | 1.24 | 0.93 |
| 2022 | 1.42 | 2.53 | 0.92 |
| 2021 | 1.52 | 2.85 | 0.38 |
| 2020 | 0.68 | 0.92 | 0.52 |
| 2019 | 0.68 | 0.98 | 0.52 |
| 2018 | 1.24 | 1.47 | 0.59 |
| 2017 | 1.58 | 2.12 | 1.27 |
| 2016 | 1.8 | 2.51 | 1.29 |
| 2015 | 230.08 | 918.86 | 1.43 |
| 2014 | 135.21 | 746.61 | 39.5 |
| 2013 | 32.27 | 61.47 | 17.53 |
| 2012 | 0 | -4.46 | |
| 2011 | 0 | -6.25 | |
| 2010 | 0 | -7.45 | |
| 2009 | 0 | -5.81 | |
| 2008 | 0 | -4.11 | |
| 2007 | 10.92 | 18.38 | 7.08 |
| 2006 | 5.72 | 8.13 | 4.13 |
| 2005 | 2.61 | 5.28 | 0.84 |
| 2004 | 1.69 | 2.76 | 1.16 |
| 2003 | 1.41 | 1.75 | 1.15 |
| 2002 | 2.6 | 3.4 | 2.23 |
| 2001 | 4.36 | 5.46 | 3.08 |
| 2000 | 3.94 | 4.55 | 3.16 |
| 1999 | 3.06 | 4.52 | 2.27 |
| 1998 | 3.18 | 3.97 | 2.32 |
| 1997 | 3.4 | 4.28 | 2.6 |