| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 22 | 148 |
| 2014 | 21 | 155 |
| 2013 | 11 | 164 |
| 2012 | 10 | 166 |
| 2011 | 10 | 165 |
| 2010 | 7 | 169 |
| 2009 | 6 | 169 |
| 2008 | 8 | 168 |
| 2007 | 5 | 172 |
| 2006 | 5 | 172 |
| 2005 | 3 | 173 |
| 2004 | 3 | 172 |
| 2003 | 2 | 176 |
| 2002 | 2 | 175 |
| 2001 | 2 | 170 |
| 2000 | 7 | 144 |
| 1999 | 5 | 152 |
| 1998 | 5 | 156 |
| 1997 | 6 | 151 |
| 1996 | 6 | 152 |
| 1995 | 5 | 149 |
| 1994 | 4 | 148 |
| 1993 | 4 | 137 |
| 1992 | 4 | 139 |
| 1991 | 4 | 126 |
| 1990 | 6 | 123 |
| 1989 | 6 | 109 |
| 1988 | 3 | 133 |
| 1987 | 3 | 129 |
| 1986 | 3 | 132 |