| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 3 | 143 |
| 2014 | 2 | 154 |
| 2013 | 2 | 160 |
| 2012 | 2 | 158 |
| 2011 | 2 | 158 |
| 2010 | 2 | 157 |
| 2009 | 2 | 154 |
| 2008 | 2 | 155 |
| 2007 | 1 | 156 |
| 2006 | 1 | 154 |
| 2005 | 1 | 152 |
| 2004 | 1 | 141 |
| 2003 | 1 | 138 |
| 2002 | 2 | 126 |
| 2001 | 2 | 126 |
| 2000 | 2 | 125 |
| 1999 | 2 | 118 |
| 1998 | 2 | 123 |
| 1997 | 2 | 110 |
| 1996 | 2 | 115 |
| 1995 | 2 | 113 |
| 1994 | 1 | 110 |
| 1993 | 3 | 92 |
| 1992 | 3 | 83 |
| 1991 | 4 | 78 |
| 1990 | 3 | 85 |
| 1989 | 2 | 85 |
| 1988 | 2 | 90 |
| 1987 | 1 | 99 |
| 1986 | 1 | 97 |