| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 15 | 93 |
| 2015 | 14 | 108 |
| 2014 | 12 | 113 |
| 2013 | 10 | 120 |
| 2012 | 9 | 126 |
| 2011 | 8 | 127 |
| 2010 | 8 | 126 |
| 2009 | 6 | 127 |
| 2008 | 5 | 133 |
| 2007 | 4 | 134 |
| 2006 | 4 | 133 |
| 2005 | 3 | 136 |
| 2004 | 3 | 138 |
| 2003 | 3 | 138 |
| 2002 | 2 | 137 |
| 2001 | 2 | 138 |
| 2000 | 2 | 140 |
| 1999 | 2 | 142 |
| 1998 | 2 | 137 |
| 1997 | 2 | 138 |
| 1996 | 2 | 134 |
| 1995 | 2 | 131 |
| 1994 | 3 | 113 |
| 1993 | 3 | 109 |
| 1992 | 4 | 100 |
| 1991 | 3 | 102 |
| 1990 | 3 | 104 |
| 1989 | 2 | 93 |
| 1988 | 4 | 85 |
| 1987 | 4 | 80 |
| 1986 | 3 | 78 |