| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 61 | 98 |
| 2015 | 57 | 119 |
| 2014 | 64 | 117 |
| 2013 | 56 | 125 |
| 2012 | 51 | 125 |
| 2011 | 50 | 122 |
| 2010 | 47 | 123 |
| 2009 | 45 | 120 |
| 2008 | 45 | 121 |
| 2007 | 39 | 123 |
| 2006 | 30 | 121 |
| 2005 | 27 | 123 |
| 2004 | 26 | 121 |
| 2003 | 23 | 118 |
| 2002 | 19 | 120 |
| 2001 | 18 | 121 |
| 2000 | 19 | 118 |
| 1999 | 20 | 110 |
| 1998 | 22 | 103 |
| 1997 | 21 | 108 |
| 1996 | 21 | 104 |
| 1995 | 20 | 103 |
| 1994 | 16 | 91 |
| 1993 | 20 | 82 |
| 1992 | 27 | 74 |
| 1991 | 26 | 75 |
| 1990 | 30 | 69 |
| 1989 | 21 | 68 |
| 1988 | 21 | 66 |
| 1987 | 13 | 71 |
| 1986 | 15 | 70 |