| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 14 | 96 |
| 2015 | 16 | 106 |
| 2014 | 16 | 109 |
| 2013 | 17 | 107 |
| 2012 | 14 | 110 |
| 2011 | 11 | 115 |
| 2010 | 8 | 121 |
| 2009 | 8 | 121 |
| 2008 | 11 | 114 |
| 2007 | 8 | 122 |
| 2006 | 6 | 125 |
| 2005 | 5 | 126 |
| 2004 | 4 | 132 |
| 2003 | 3 | 134 |
| 2002 | 3 | 134 |
| 2001 | 3 | 132 |
| 2000 | 3 | 131 |
| 1999 | 3 | 128 |
| 1998 | 4 | 126 |
| 1997 | 4 | 126 |
| 1996 | 5 | 112 |
| 1995 | 5 | 114 |
| 1994 | 3 | 117 |
| 1993 | 2 | 114 |
| 1992 | 3 | 105 |
| 1991 | 3 | 108 |
| 1990 | 3 | 101 |
| 1989 | 6 | 76 |
| 1988 | 5 | 76 |
| 1987 | 5 | 77 |
| 1986 | 5 | 68 |