| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 14 | 114 |
| 2015 | 15 | 132 |
| 2014 | 20 | 132 |
| 2013 | 17 | 137 |
| 2012 | 16 | 138 |
| 2011 | 15 | 139 |
| 2010 | 13 | 141 |
| 2009 | 12 | 138 |
| 2008 | 11 | 141 |
| 2007 | 8 | 142 |
| 2006 | 7 | 141 |
| 2005 | 6 | 139 |
| 2004 | 20 | 107 |
| 2003 | 6 | 134 |
| 2002 | 3 | 148 |
| 2001 | 2 | 149 |
| 2000 | 2 | 155 |
| 1999 | 2 | 147 |
| 1998 | 2 | 146 |
| 1997 | 2 | 149 |
| 1996 | 2 | 146 |
| 1995 | 2 | 147 |
| 1994 | 1 | 133 |
| 1993 | 2 | 125 |
| 1992 | 2 | 118 |
| 1991 | 2 | 117 |
| 1990 | 3 | 111 |
| 1989 | 2 | 96 |
| 1988 | 2 | 98 |
| 1987 | 2 | 99 |
| 1986 | 2 | 93 |