| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 119 | 99 |
| 2014 | 145 | 92 |
| 2013 | 149 | 92 |
| 2012 | 136 | 94 |
| 2011 | 118 | 95 |
| 2010 | 107 | 95 |
| 2009 | 79 | 100 |
| 2008 | 88 | 100 |
| 2007 | 67 | 103 |
| 2006 | 61 | 99 |
| 2005 | 41 | 108 |
| 2004 | 30 | 115 |
| 2003 | 24 | 116 |
| 2002 | 21 | 118 |
| 2001 | 20 | 118 |
| 2000 | 18 | 121 |
| 1999 | 16 | 118 |
| 1998 | 16 | 120 |
| 1997 | 18 | 115 |
| 1996 | 15 | 117 |
| 1995 | 15 | 113 |
| 1994 | 14 | 97 |
| 1993 | 7 | 109 |
| 1992 | 8 | 107 |
| 1991 | 10 | 105 |
| 1990 | 8 | 106 |
| 1989 | 9 | 85 |
| 1988 | 13 | 73 |
| 1987 | 9 | 82 |
| 1986 | 6 | 85 |