| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 46 | 104 |
| 2015 | 50 | 105 |
| 2014 | 57 | 107 |
| 2013 | 41 | 117 |
| 2012 | 29 | 123 |
| 2011 | 29 | 124 |
| 2010 | 23 | 123 |
| 2009 | 16 | 129 |
| 2008 | 16 | 134 |
| 2007 | 13 | 138 |
| 2006 | 10 | 136 |
| 2005 | 9 | 135 |
| 2004 | 7 | 142 |
| 2003 | 5 | 146 |
| 2002 | 5 | 140 |
| 2001 | 5 | 138 |
| 2000 | 5 | 137 |
| 1999 | 5 | 137 |
| 1998 | 6 | 127 |
| 1997 | 6 | 129 |
| 1996 | 4 | 140 |
| 1995 | 4 | 136 |
| 1994 | 4 | 132 |
| 1993 | 2 | 132 |
| 1992 | 2 | 136 |
| 1991 | 2 | 130 |
| 1990 | 3 | 120 |
| 1989 | 5 | 108 |
| 1988 | 4 | 107 |
| 1987 | 4 | 109 |
| 1986 | 5 | 101 |