| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 12550 | 3 |
| 2014 | 13407 | 3 |
| 2013 | 13888 | 3 |
| 2012 | 16592 | 3 |
| 2011 | 16552 | 3 |
| 2010 | 16214 | 3 |
| 2009 | 14267 | 3 |
| 2008 | 14613 | 3 |
| 2007 | 13493 | 3 |
| 2006 | 13583 | 2 |
| 2005 | 14361 | 2 |
| 2004 | 14589 | 2 |
| 2003 | 13522 | 2 |
| 2002 | 12567 | 2 |
| 2001 | 13457 | 2 |
| 2000 | 16011 | 2 |
| 1999 | 15073 | 2 |
| 1998 | 13528 | 2 |
| 1997 | 15059 | 2 |
| 1996 | 16676 | 1 |
| 1995 | 18753 | 1 |
| 1994 | 17029 | 1 |
| 1993 | 15390 | 1 |
| 1992 | 13952 | 1 |
| 1991 | 13184 | 1 |
| 1990 | 11630 | 1 |
| 1989 | 11236 | 1 |
| 1988 | 11229 | 1 |
| 1987 | 9210 | 1 |
| 1986 | 7611 | 1 |