| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 127 | 64 |
| 2015 | 121 | 75 |
| 2014 | 134 | 75 |
| 2013 | 132 | 79 |
| 2012 | 135 | 78 |
| 2011 | 147 | 73 |
| 2010 | 120 | 76 |
| 2009 | 137 | 68 |
| 2008 | 136 | 74 |
| 2007 | 116 | 74 |
| 2006 | 86 | 75 |
| 2005 | 72 | 76 |
| 2004 | 60 | 74 |
| 2003 | 51 | 74 |
| 2002 | 39 | 75 |
| 2001 | 33 | 80 |
| 2000 | 30 | 82 |
| 1999 | 30 | 77 |
| 1998 | 32 | 76 |
| 1997 | 24 | 84 |
| 1996 | 19 | 90 |
| 1995 | 33 | 69 |
| 1994 | 29 | 57 |
| 1993 | 35 | 57 |
| 1992 | 40 | 51 |
| 1991 | 44 | 49 |
| 1990 | 106 | 41 |
| 1989 | 131 | 31 |
| 1988 | 138 | 28 |
| 1987 | 173 | 26 |
| 1986 | 130 | 25 |