| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 28 | 73 |
| 2015 | 27 | 86 |
| 2014 | 26 | 94 |
| 2013 | 25 | 92 |
| 2012 | 24 | 93 |
| 2011 | 24 | 94 |
| 2010 | 22 | 91 |
| 2009 | 26 | 83 |
| 2008 | 26 | 84 |
| 2007 | 25 | 81 |
| 2006 | 24 | 72 |
| 2005 | 25 | 72 |
| 2004 | 25 | 70 |
| 2003 | 24 | 67 |
| 2002 | 24 | 60 |
| 2001 | 23 | 62 |
| 2000 | 24 | 62 |
| 1999 | 20 | 68 |
| 1998 | 17 | 75 |
| 1997 | 16 | 77 |
| 1996 | 13 | 81 |
| 1995 | 12 | 83 |
| 1994 | 11 | 73 |
| 1993 | 8 | 82 |
| 1992 | 7 | 77 |
| 1991 | 7 | 84 |
| 1990 | 5 | 92 |
| 1989 | 5 | 80 |
| 1988 | 4 | 82 |
| 1987 | 4 | 79 |
| 1986 | 4 | 75 |