| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 32 | 131 |
| 2015 | 30 | 138 |
| 2014 | 36 | 141 |
| 2013 | 44 | 133 |
| 2012 | 31 | 141 |
| 2011 | 24 | 148 |
| 2010 | 20 | 149 |
| 2009 | 19 | 148 |
| 2008 | 20 | 148 |
| 2007 | 17 | 151 |
| 2006 | 13 | 150 |
| 2005 | 13 | 146 |
| 2004 | 13 | 143 |
| 2003 | 9 | 142 |
| 2002 | 7 | 143 |
| 2001 | 7 | 147 |
| 2000 | 6 | 148 |
| 1999 | 7 | 142 |
| 1998 | 7 | 140 |
| 1997 | 6 | 153 |
| 1996 | 6 | 147 |
| 1995 | 5 | 151 |
| 1994 | 3 | 153 |
| 1993 | 5 | 130 |
| 1992 | 5 | 129 |
| 1991 | 5 | 118 |
| 1990 | 5 | 124 |
| 1989 | 4 | 126 |
| 1988 | 5 | 124 |
| 1987 | 4 | 119 |
| 1986 | 4 | 117 |