| 序号 | 时间 (年) |
数据 (美元) |
|---|---|---|
| 1 | 2021 | |
| 2 | 2020 | |
| 3 | 2019 | |
| 4 | 2018 | |
| 5 | 2017 | |
| 6 | 2016 | |
| 7 | 2015 | |
| 8 | 2014 | |
| 9 | 2013 | |
| 10 | 2012 | |
| 11 | 2011 | 24103.52 |
| 12 | 2010 | 24243.47 |
| 13 | 2009 | 23365.07 |
| 14 | 2008 | 22717.15 |
| 15 | 2007 | 21717.91 |
| 16 | 2006 | 21484.81 |
| 17 | 2005 | 21463.31 |
| 18 | 2004 | 20723.35 |
| 19 | 2003 | 19898.57 |
| 20 | 2002 | 18970.52 |
| 21 | 2001 | 18678.92 |
| 22 | 2000 | 18363.61 |
| 23 | 1999 | 18695.08 |
| 24 | 1998 | 20267.62 |
| 25 | 1997 | 19720.20 |
| 26 | 1996 | 19515.73 |
| 27 | 1995 | 18497.70 |
| 28 | 1994 | 17710.69 |
| 29 | 1993 | 16868.89 |
| 30 | 1992 | 16445.54 |
| 31 | 1991 | 14973.60 |
