| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 7 | 121 |
| 2015 | 7 | 144 |
| 2014 | 8 | 147 |
| 2013 | 8 | 149 |
| 2012 | 7 | 150 |
| 2011 | 7 | 151 |
| 2010 | 5 | 153 |
| 2009 | 5 | 151 |
| 2008 | 6 | 151 |
| 2007 | 5 | 156 |
| 2006 | 4 | 154 |
| 2005 | 4 | 152 |
| 2004 | 3 | 153 |
| 2003 | 3 | 151 |
| 2002 | 3 | 150 |
| 2001 | 2 | 148 |
| 2000 | 2 | 146 |
| 1999 | 3 | 143 |
| 1998 | 3 | 143 |
| 1997 | 3 | 141 |
| 1996 | 3 | 139 |
| 1995 | 3 | 140 |
| 1994 | 2 | 126 |
| 1993 | 3 | 121 |
| 1992 | 4 | 107 |
| 1991 | 4 | 108 |
| 1990 | 4 | 109 |
| 1989 | 3 | 92 |
| 1988 | 3 | 89 |
| 1987 | 2 | 90 |
| 1986 | 2 | 91 |