| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 8 | 120 |
| 2015 | 9 | 141 |
| 2014 | 9 | 144 |
| 2013 | 8 | 148 |
| 2012 | 9 | 147 |
| 2011 | 12 | 144 |
| 2010 | 11 | 144 |
| 2009 | 9 | 142 |
| 2008 | 9 | 143 |
| 2007 | 8 | 143 |
| 2006 | 7 | 142 |
| 2005 | 5 | 143 |
| 2004 | 5 | 139 |
| 2003 | 6 | 135 |
| 2002 | 6 | 132 |
| 2001 | 3 | 145 |
| 2000 | 3 | 143 |
| 1999 | 3 | 137 |
| 1998 | 3 | 140 |
| 1997 | 4 | 129 |
| 1996 | 4 | 130 |
| 1995 | 2 | 142 |
| 1994 | 2 | 124 |
| 1993 | 5 | 104 |
| 1992 | 5 | 98 |
| 1991 | 5 | 101 |
| 1990 | 5 | 101 |
| 1989 | 4 | 89 |
| 1988 | 3 | 90 |
| 1987 | 3 | 89 |
| 1986 | 2 | 89 |