| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 99 | 74 |
| 2015 | 98 | 83 |
| 2014 | 94 | 91 |
| 2013 | 88 | 94 |
| 2012 | 82 | 93 |
| 2011 | 79 | 92 |
| 2010 | 71 | 90 |
| 2009 | 68 | 87 |
| 2008 | 67 | 91 |
| 2007 | 48 | 95 |
| 2006 | 38 | 98 |
| 2005 | 32 | 95 |
| 2004 | 29 | 95 |
| 2003 | 24 | 94 |
| 2002 | 22 | 91 |
| 2001 | 20 | 96 |
| 2000 | 19 | 99 |
| 1999 | 18 | 95 |
| 1998 | 18 | 93 |
| 1997 | 16 | 96 |
| 1996 | 15 | 96 |
| 1995 | 17 | 90 |
| 1994 | 15 | 78 |
| 1993 | 13 | 80 |
| 1992 | 13 | 81 |
| 1991 | 9 | 88 |
| 1990 | 10 | 89 |
| 1989 | 10 | 74 |
| 1988 | 13 | 64 |
| 1987 | 16 | 58 |
| 1986 | 15 | 55 |