| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 21503 | 2 |
| 2015 | 20852 | 4 |
| 2014 | 23981 | 4 |
| 2013 | 23251 | 4 |
| 2012 | 21819 | 4 |
| 2011 | 23159 | 4 |
| 2010 | 21253 | 4 |
| 2009 | 21912 | 4 |
| 2008 | 23307 | 3 |
| 2007 | 21246 | 4 |
| 2006 | 18767 | 3 |
| 2005 | 18085 | 3 |
| 2004 | 17777 | 3 |
| 2003 | 15815 | 3 |
| 2002 | 13106 | 3 |
| 2001 | 12117 | 3 |
| 2000 | 11968 | 3 |
| 1999 | 13526 | 3 |
| 1998 | 13747 | 3 |
| 1997 | 13569 | 3 |
| 1996 | 15220 | 2 |
| 1995 | 15512 | 2 |
| 1994 | 13032 | 2 |
| 1993 | 12228 | 2 |
| 1992 | 12158 | 2 |
| 1991 | 10489 | 2 |