| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2014 | 14 | 114 |
| 2013 | 14 | 116 |
| 2012 | 13 | 117 |
| 2011 | 12 | 113 |
| 2010 | 11 | 111 |
| 2009 | 11 | 103 |
| 2008 | 14 | 100 |
| 2007 | 12 | 103 |
| 2006 | 8 | 105 |
| 2005 | 8 | 106 |
| 2004 | 7 | 98 |
| 2003 | 6 | 100 |
| 2002 | 5 | 103 |
| 2001 | 4 | 101 |
| 2000 | 4 | 101 |
| 1999 | 4 | 99 |
| 1998 | 4 | 96 |
| 1997 | 4 | 95 |
| 1996 | 4 | 92 |
| 1995 | 4 | 88 |
| 1994 | 3 | 87 |
| 1993 | 4 | 82 |
| 1992 | 4 | 76 |
| 1991 | 4 | 77 |
| 1990 | 4 | 75 |
| 1989 | 3 | 82 |
| 1988 | 3 | 73 |
| 1987 | 3 | 72 |
| 1986 | 3 | 69 |