| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 23 | 92 |
| 2014 | 21 | 100 |
| 2013 | 19 | 106 |
| 2012 | 22 | 97 |
| 2011 | 19 | 102 |
| 2010 | 4 | 147 |
| 2009 | 3 | 145 |
| 2008 | 3 | 150 |
| 2007 | 3 | 142 |
| 2006 | 3 | 139 |
| 2005 | 5 | 123 |
| 2004 | 3 | 125 |
| 2003 | 3 | 119 |
| 2002 | 3 | 110 |
| 2001 | 3 | 109 |
| 2000 | 4 | 105 |
| 1999 | 3 | 111 |
| 1998 | 2 | 109 |
| 1997 | 2 | 108 |
| 1996 | 2 | 112 |
| 1995 | 2 | 106 |
| 1994 | 4 | 83 |
| 1993 | 5 | 80 |
| 1992 | 5 | 69 |
| 1991 | 5 | 67 |
| 1990 | 5 | 68 |
| 1989 | 4 | 69 |
| 1988 | 4 | 64 |
| 1987 | 5 | 57 |
| 1986 | 6 | 51 |