| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 53 | 102 |
| 2015 | 56 | 120 |
| 2014 | 56 | 125 |
| 2013 | 56 | 123 |
| 2012 | 58 | 120 |
| 2011 | 48 | 126 |
| 2010 | 32 | 135 |
| 2009 | 20 | 144 |
| 2008 | 22 | 141 |
| 2007 | 14 | 149 |
| 2006 | 11 | 149 |
| 2005 | 9 | 149 |
| 2004 | 8 | 153 |
| 2003 | 7 | 148 |
| 2002 | 7 | 145 |
| 2001 | 5 | 148 |
| 2000 | 4 | 153 |
| 1999 | 4 | 152 |
| 1998 | 4 | 150 |
| 1997 | 4 | 151 |
| 1996 | 4 | 145 |
| 1995 | 4 | 143 |
| 1994 | 3 | 131 |
| 1993 | 3 | 129 |
| 1992 | 4 | 116 |
| 1991 | 10 | 102 |
| 1990 | 11 | 97 |
| 1989 | 16 | 72 |
| 1988 | 17 | 70 |
| 1987 | 17 | 70 |
| 1986 | 15 | 68 |