| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 30420 | 3 |
| 2014 | 34138 | 3 |
| 2013 | 36785 | 3 |
| 2012 | 44406 | 2 |
| 2011 | 44053 | 2 |
| 2010 | 40020 | 2 |
| 2009 | 37422 | 2 |
| 2008 | 35147 | 2 |
| 2007 | 31194 | 2 |
| 2006 | 31238 | 2 |
| 2005 | 32796 | 2 |
| 2004 | 32987 | 2 |
| 2003 | 30387 | 2 |
| 2002 | 28009 | 2 |
| 2001 | 28788 | 2 |
| 2000 | 32190 | 2 |
| 1999 | 29996 | 2 |
| 1998 | 26179 | 2 |
| 1997 | 28344 | 2 |
| 1996 | 30584 | 1 |
| 1995 | 34434 | 1 |
| 1994 | 30930 | 1 |
| 1993 | 28446 | 1 |
| 1992 | 24227 | 1 |
| 1991 | 21748 | 1 |
| 1990 | 18849 | 1 |
| 1989 | 18400 | 1 |
| 1988 | 18491 | 1 |
| 1987 | 15321 | 1 |
| 1986 | 12394 | 1 |