| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 18 | 121 |
| 2015 | 19 | 144 |
| 2014 | 19 | 146 |
| 2013 | 18 | 150 |
| 2012 | 17 | 150 |
| 2011 | 16 | 153 |
| 2010 | 15 | 154 |
| 2009 | 13 | 154 |
| 2008 | 13 | 154 |
| 2007 | 11 | 156 |
| 2006 | 9 | 155 |
| 2005 | 7 | 155 |
| 2004 | 6 | 159 |
| 2003 | 6 | 156 |
| 2002 | 5 | 155 |
| 2001 | 4 | 153 |
| 2000 | 4 | 155 |
| 1999 | 5 | 146 |
| 1998 | 5 | 148 |
| 1997 | 5 | 144 |
| 1996 | 5 | 139 |
| 1995 | 5 | 140 |
| 1994 | 5 | 123 |
| 1993 | 4 | 120 |
| 1992 | 5 | 112 |
| 1991 | 5 | 113 |
| 1990 | 4 | 114 |
| 1989 | 3 | 97 |
| 1988 | 3 | 98 |
| 1987 | 3 | 97 |
| 1986 | 3 | 94 |