| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 6069 | 4 |
| 2015 | 6480 | 4 |
| 2014 | 8122 | 4 |
| 2013 | 8332 | 4 |
| 2012 | 8858 | 4 |
| 2011 | 8554 | 4 |
| 2010 | 6941 | 4 |
| 2009 | 5520 | 5 |
| 2008 | 7625 | 4 |
| 2007 | 6222 | 6 |
| 2006 | 5791 | 5 |
| 2005 | 5159 | 5 |
| 2004 | 4545 | 6 |
| 2003 | 3829 | 6 |
| 2002 | 3372 | 4 |
| 2001 | 3491 | 3 |
| 2000 | 3795 | 3 |
| 1999 | 3100 | 5 |
| 1998 | 2805 | 5 |
| 1997 | 3388 | 3 |
| 1996 | 3492 | 3 |
| 1995 | 3359 | 3 |
| 1994 | 2752 | 3 |
| 1993 | 2416 | 3 |
| 1992 | 2332 | 4 |
| 1991 | 2370 | 3 |
| 1990 | 2354 | 3 |
| 1989 | 2097 | 3 |
| 1988 | 1874 | 4 |
| 1987 | 1510 | 5 |
| 1986 | 1276 | 4 |