| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 66 | 116 |
| 2014 | 72 | 115 |
| 2013 | 71 | 117 |
| 2012 | 71 | 114 |
| 2011 | 70 | 113 |
| 2010 | 63 | 113 |
| 2009 | 49 | 119 |
| 2008 | 43 | 123 |
| 2007 | 45 | 119 |
| 2006 | 40 | 117 |
| 2005 | 40 | 109 |
| 2004 | 37 | 108 |
| 2003 | 28 | 108 |
| 2002 | 17 | 123 |
| 2001 | 19 | 120 |
| 2000 | 21 | 111 |
| 1999 | 23 | 106 |
| 1998 | 22 | 102 |
| 1997 | 25 | 98 |
| 1996 | 24 | 95 |
| 1995 | 23 | 96 |
| 1994 | 20 | 80 |
| 1993 | 19 | 84 |
| 1992 | 20 | 83 |
| 1991 | 17 | 84 |
| 1990 | 15 | 83 |
| 1989 | 13 | 73 |
| 1988 | 13 | 72 |
| 1987 | 13 | 72 |
| 1986 | 9 | 75 |