| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 9 | 118 |
| 2015 | 6 | 149 |
| 2014 | 6 | 151 |
| 2013 | 6 | 154 |
| 2012 | 7 | 152 |
| 2011 | 5 | 153 |
| 2010 | 4 | 155 |
| 2009 | 4 | 157 |
| 2008 | 4 | 158 |
| 2007 | 3 | 158 |
| 2006 | 2 | 158 |
| 2005 | 1 | 167 |
| 2004 | 2 | 158 |
| 2003 | 2 | 156 |
| 2002 | 2 | 155 |
| 2001 | 2 | 153 |
| 2000 | 2 | 152 |
| 1999 | 2 | 148 |
| 1998 | 2 | 148 |
| 1997 | 2 | 148 |
| 1996 | 2 | 147 |
| 1995 | 2 | 148 |
| 1994 | 2 | 130 |
| 1993 | 1 | 127 |
| 1992 | 1 | 126 |
| 1991 | 1 | 124 |
| 1990 | 1 | 123 |
| 1989 | 1 | 102 |
| 1988 | 1 | 101 |
| 1987 | 1 | 101 |
| 1986 | 1 | 96 |