| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 28 | 98 |
| 2015 | 29 | 115 |
| 2014 | 28 | 119 |
| 2013 | 27 | 121 |
| 2012 | 27 | 122 |
| 2011 | 27 | 123 |
| 2010 | 23 | 122 |
| 2009 | 19 | 121 |
| 2008 | 20 | 123 |
| 2007 | 16 | 127 |
| 2006 | 15 | 126 |
| 2005 | 13 | 123 |
| 2004 | 12 | 128 |
| 2003 | 11 | 123 |
| 2002 | 10 | 114 |
| 2001 | 10 | 115 |
| 2000 | 11 | 109 |
| 1999 | 10 | 111 |
| 1998 | 10 | 111 |
| 1997 | 11 | 108 |
| 1996 | 10 | 107 |
| 1995 | 9 | 109 |
| 1994 | 8 | 96 |
| 1993 | 7 | 94 |
| 1992 | 7 | 95 |
| 1991 | 6 | 98 |
| 1990 | 6 | 100 |
| 1989 | 6 | 83 |
| 1988 | 5 | 83 |
| 1987 | 4 | 84 |
| 1986 | 4 | 79 |