| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 13 | 149 |
| 2014 | 14 | 151 |
| 2013 | 14 | 155 |
| 2012 | 15 | 154 |
| 2011 | 15 | 155 |
| 2010 | 13 | 157 |
| 2009 | 10 | 156 |
| 2008 | 9 | 157 |
| 2007 | 9 | 157 |
| 2006 | 9 | 156 |
| 2005 | 8 | 153 |
| 2004 | 7 | 155 |
| 2003 | 6 | 154 |
| 2002 | 4 | 161 |
| 2001 | 4 | 159 |
| 2000 | 5 | 151 |
| 1999 | 5 | 145 |
| 1998 | 5 | 146 |
| 1997 | 6 | 140 |
| 1996 | 5 | 138 |
| 1995 | 5 | 135 |
| 1994 | 5 | 122 |
| 1993 | 4 | 118 |
| 1992 | 4 | 117 |
| 1991 | 4 | 118 |
| 1990 | 3 | 116 |
| 1989 | 3 | 102 |
| 1988 | 3 | 102 |
| 1987 | 2 | 100 |
| 1986 | 2 | 100 |