| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 19504 | 1 |
| 2015 | 20458 | 2 |
| 2014 | 22612 | 2 |
| 2013 | 21194 | 2 |
| 2012 | 19432 | 2 |
| 2011 | 18254 | 2 |
| 2010 | 13801 | 2 |
| 2009 | 10296 | 3 |
| 2008 | 11465 | 3 |
| 2007 | 9490 | 3 |
| 2006 | 7828 | 4 |
| 2005 | 6487 | 4 |
| 2004 | 5562 | 4 |
| 2003 | 4121 | 6 |
| 2002 | 2956 | 7 |
| 2001 | 2440 | 8 |
| 2000 | 2243 | 9 |
| 1999 | 1681 | 11 |
| 1998 | 1449 | 12 |
| 1997 | 1446 | 14 |
| 1996 | 1373 | 14 |
| 1995 | 1199 | 15 |
| 1994 | 973 | 15 |
| 1993 | 861 | 16 |
| 1992 | 618 | 19 |
| 1991 | 439 | 22 |
| 1990 | 385 | 22 |
| 1989 | 461 | 19 |
| 1988 | 490 | 15 |
| 1987 | 338 | 16 |
| 1986 | 336 | 14 |