| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 49 | 101 |
| 2015 | 47 | 109 |
| 2014 | 58 | 106 |
| 2013 | 43 | 116 |
| 2012 | 44 | 114 |
| 2011 | 48 | 113 |
| 2010 | 29 | 121 |
| 2009 | 19 | 125 |
| 2008 | 25 | 120 |
| 2007 | 19 | 126 |
| 2006 | 15 | 128 |
| 2005 | 11 | 131 |
| 2004 | 9 | 134 |
| 2003 | 6 | 135 |
| 2002 | 5 | 133 |
| 2001 | 5 | 134 |
| 2000 | 5 | 134 |
| 1999 | 5 | 140 |
| 1998 | 5 | 135 |
| 1997 | 6 | 132 |
| 1996 | 4 | 139 |
| 1995 | 5 | 131 |
| 1994 | 4 | 135 |
| 1993 | 4 | 121 |
| 1992 | 4 | 118 |
| 1991 | 3 | 112 |
| 1990 | 7 | 101 |
| 1989 | 7 | 97 |
| 1988 | 7 | 93 |
| 1987 | 7 | 91 |
| 1986 | 7 | 90 |