| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 100 | 82 |
| 2015 | 85 | 89 |
| 2014 | 68 | 103 |
| 2013 | 67 | 101 |
| 2012 | 78 | 99 |
| 2011 | 67 | 103 |
| 2010 | 51 | 105 |
| 2009 | 42 | 104 |
| 2008 | 47 | 109 |
| 2007 | 41 | 108 |
| 2006 | 37 | 105 |
| 2005 | 31 | 103 |
| 2004 | 28 | 102 |
| 2003 | 21 | 106 |
| 2002 | 19 | 103 |
| 2001 | 15 | 109 |
| 2000 | 14 | 108 |
| 1999 | 11 | 109 |
| 1998 | 8 | 114 |
| 1997 | 7 | 120 |
| 1996 | 6 | 122 |
| 1995 | 9 | 115 |
| 1994 | 5 | 123 |
| 1993 | 3 | 129 |
| 1992 | 3 | 130 |
| 1991 | 2 | 126 |
| 1990 | 1 | 141 |
| 1989 | 0 | 150 |
| 1988 | 0 | 152 |
| 1987 | 0 | 155 |
| 1986 | 0 | 154 |