| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 33 | 112 |
| 2014 | 38 | 110 |
| 2013 | 38 | 111 |
| 2012 | 39 | 109 |
| 2011 | 35 | 111 |
| 2010 | 31 | 111 |
| 2009 | 26 | 113 |
| 2008 | 29 | 112 |
| 2007 | 28 | 112 |
| 2006 | 26 | 110 |
| 2005 | 19 | 111 |
| 2004 | 18 | 108 |
| 2003 | 13 | 111 |
| 2002 | 10 | 117 |
| 2001 | 10 | 114 |
| 2000 | 10 | 115 |
| 1999 | 8 | 119 |
| 1998 | 9 | 120 |
| 1997 | 9 | 115 |
| 1996 | 8 | 113 |
| 1995 | 9 | 112 |
| 1994 | 9 | 89 |
| 1993 | 7 | 93 |
| 1992 | 9 | 88 |
| 1991 | 8 | 94 |
| 1990 | 8 | 93 |
| 1989 | 9 | 78 |
| 1988 | 8 | 77 |
| 1987 | 7 | 78 |
| 1986 | 6 | 76 |