| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2013 | 13 | 112 |
| 2012 | 13 | 109 |
| 2011 | 12 | 109 |
| 2010 | 10 | 110 |
| 2009 | 7 | 117 |
| 2008 | 11 | 106 |
| 2007 | 8 | 109 |
| 2006 | 6 | 111 |
| 2005 | 4 | 115 |
| 2004 | 4 | 108 |
| 2003 | 3 | 113 |
| 2002 | 5 | 95 |
| 2001 | 4 | 92 |
| 2000 | 4 | 97 |
| 1999 | 3 | 99 |
| 1998 | 3 | 99 |
| 1997 | 3 | 95 |
| 1996 | 3 | 96 |
| 1995 | 2 | 96 |
| 1994 | 2 | 96 |
| 1993 | 2 | 96 |
| 1992 | 1 | 91 |
| 1991 | 1 | 86 |
| 1990 | 1 | 86 |
| 1989 | 1 | 87 |
| 1988 | 1 | 85 |
| 1987 | 1 | 90 |
| 1986 | 1 | 92 |