| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 62 | 108 |
| 2015 | 61 | 124 |
| 2014 | 63 | 127 |
| 2013 | 68 | 127 |
| 2012 | 67 | 125 |
| 2011 | 76 | 117 |
| 2010 | 52 | 126 |
| 2009 | 32 | 136 |
| 2008 | 30 | 140 |
| 2007 | 25 | 141 |
| 2006 | 26 | 133 |
| 2005 | 24 | 130 |
| 2004 | 24 | 125 |
| 2003 | 22 | 123 |
| 2002 | 22 | 116 |
| 2001 | 22 | 108 |
| 2000 | 24 | 103 |
| 1999 | 23 | 104 |
| 1998 | 29 | 99 |
| 1997 | 38 | 93 |
| 1996 | 31 | 95 |
| 1995 | 29 | 92 |
| 1994 | 25 | 89 |
| 1993 | 21 | 91 |
| 1992 | 25 | 86 |
| 1991 | 23 | 83 |
| 1990 | 20 | 88 |
| 1989 | 18 | 79 |
| 1988 | 16 | 80 |
| 1987 | 14 | 83 |
| 1986 | 13 | 80 |