| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 24 | 120 |
| 2015 | 22 | 127 |
| 2014 | 25 | 129 |
| 2013 | 24 | 130 |
| 2012 | 22 | 132 |
| 2011 | 24 | 129 |
| 2010 | 16 | 134 |
| 2009 | 9 | 148 |
| 2008 | 7 | 155 |
| 2007 | 6 | 157 |
| 2006 | 6 | 153 |
| 2005 | 5 | 155 |
| 2004 | 5 | 152 |
| 2003 | 3 | 156 |
| 2002 | 2 | 156 |
| 2001 | 2 | 157 |
| 2000 | 2 | 160 |
| 1999 | 3 | 155 |
| 1998 | 3 | 149 |
| 1997 | 2 | 153 |
| 1996 | 2 | 152 |
| 1995 | 3 | 146 |
| 1994 | 1 | 161 |
| 1993 | 1 | 151 |
| 1992 | 1 | 157 |
| 1991 | 1 | 139 |
| 1990 | 2 | 132 |
| 1989 | 1 | 137 |
| 1988 | 1 | 131 |
| 1987 | 2 | 128 |
| 1986 | 1 | 136 |