| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2013 | 8 | 127 |
| 2012 | 8 | 128 |
| 2011 | 8 | 129 |
| 2010 | 8 | 124 |
| 2009 | 6 | 130 |
| 2008 | 5 | 134 |
| 2007 | 4 | 135 |
| 2006 | 5 | 128 |
| 2005 | 5 | 127 |
| 2004 | 5 | 126 |
| 2003 | 4 | 126 |
| 2002 | 4 | 126 |
| 2001 | 5 | 118 |
| 2000 | 7 | 99 |
| 1999 | 5 | 116 |
| 1998 | 6 | 111 |
| 1997 | 6 | 108 |
| 1996 | 5 | 111 |
| 1995 | 4 | 118 |
| 1994 | 5 | 94 |
| 1993 | 6 | 96 |
| 1992 | 6 | 89 |
| 1991 | 6 | 86 |
| 1990 | 6 | 88 |
| 1989 | 6 | 73 |
| 1988 | 6 | 75 |
| 1987 | 6 | 71 |
| 1986 | 5 | 70 |