| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 7872 | 5 |
| 2014 | 9703 | 4 |
| 2013 | 9400 | 4 |
| 2012 | 9982 | 4 |
| 2011 | 9524 | 4 |
| 2010 | 7739 | 4 |
| 2009 | 6262 | 6 |
| 2008 | 8552 | 5 |
| 2007 | 7044 | 6 |
| 2006 | 6550 | 5 |
| 2005 | 5946 | 5 |
| 2004 | 5273 | 6 |
| 2003 | 4421 | 5 |
| 2002 | 3978 | 4 |
| 2001 | 4118 | 4 |
| 2000 | 4494 | 3 |
| 1999 | 3831 | 4 |
| 1998 | 3511 | 4 |
| 1997 | 4190 | 3 |
| 1996 | 4372 | 3 |
| 1995 | 4200 | 3 |
| 1994 | 3484 | 3 |
| 1993 | 3106 | 3 |
| 1992 | 3017 | 3 |
| 1991 | 3008 | 3 |
| 1990 | 2982 | 3 |
| 1989 | 2705 | 3 |
| 1988 | 2359 | 3 |
| 1987 | 1834 | 5 |
| 1986 | 1523 | 4 |