| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 1557 | 7 |
| 2014 | 1566 | 7 |
| 2013 | 1487 | 6 |
| 2012 | 1450 | 6 |
| 2011 | 1379 | 6 |
| 2010 | 1166 | 7 |
| 2009 | 925 | 10 |
| 2008 | 1057 | 10 |
| 2007 | 862 | 10 |
| 2006 | 692 | 11 |
| 2005 | 519 | 14 |
| 2004 | 377 | 16 |
| 2003 | 236 | 20 |
| 2002 | 191 | 21 |
| 2001 | 168 | 21 |
| 2000 | 160 | 22 |
| 1999 | 140 | 23 |
| 1998 | 111 | 24 |
| 1997 | 89 | 27 |
| 1996 | 72 | 30 |
| 1995 | 68 | 30 |
| 1994 | 60 | 29 |
| 1993 | 50 | 26 |
| 1992 | 49 | 24 |
| 1991 | 49 | 23 |
| 1990 | 46 | 24 |
| 1989 | 41 | 22 |
| 1988 | 37 | 23 |
| 1987 | 33 | 22 |
| 1986 | 31 | 19 |