| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 1973 | 83 |
| 2015 | 1874 | 103 |
| 2014 | 1791 | 107 |
| 2013 | 1724 | 111 |
| 2012 | 1660 | 111 |
| 2011 | 1583 | 113 |
| 2010 | 1524 | 126 |
| 2009 | 1498 | 109 |
| 2008 | 1488 | 110 |
| 2007 | 1459 | 110 |
| 2006 | 1418 | 106 |
| 2005 | 1385 | 101 |
| 2004 | 1351 | 100 |
| 2003 | 1301 | 99 |
| 2002 | 1258 | 99 |
| 2001 | 1222 | 96 |
| 2000 | 1200 | 93 |
| 1999 | 1165 | 90 |
| 1998 | 1145 | 90 |
| 1997 | 1131 | 88 |
| 1996 | 1102 | 88 |
| 1995 | 1077 | 87 |
| 1994 | 1062 | 83 |
| 1993 | 1048 | 78 |
| 1992 | 1042 | 80 |
| 1991 | 1034 | 79 |
| 1990 | 1037 | 77 |
| 1989 | 1009 | 65 |
| 1988 | 986 | 62 |
| 1987 | 953 | 63 |
| 1986 | 941 | 64 |