| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 5 | 131 |
| 2014 | 6 | 138 |
| 2013 | 6 | 143 |
| 2012 | 6 | 142 |
| 2011 | 5 | 143 |
| 2010 | 4 | 142 |
| 2009 | 5 | 138 |
| 2008 | 6 | 127 |
| 2007 | 5 | 129 |
| 2006 | 5 | 123 |
| 2005 | 5 | 119 |
| 2004 | 5 | 110 |
| 2003 | 4 | 111 |
| 2002 | 3 | 118 |
| 2001 | 3 | 110 |
| 2000 | 3 | 107 |
| 1999 | 4 | 101 |
| 1998 | 3 | 102 |
| 1997 | 4 | 96 |
| 1996 | 4 | 91 |
| 1995 | 4 | 90 |
| 1994 | 3 | 85 |
| 1993 | 3 | 87 |
| 1992 | 3 | 86 |
| 1991 | 3 | 86 |
| 1990 | 2 | 87 |
| 1989 | 2 | 91 |
| 1988 | 2 | 96 |
| 1987 | 2 | 93 |
| 1986 | 1 | 93 |