| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 45 | 113 |
| 2015 | 44 | 133 |
| 2014 | 49 | 135 |
| 2013 | 49 | 138 |
| 2012 | 41 | 143 |
| 2011 | 36 | 143 |
| 2010 | 27 | 144 |
| 2009 | 23 | 146 |
| 2008 | 22 | 149 |
| 2007 | 17 | 152 |
| 2006 | 15 | 149 |
| 2005 | 14 | 146 |
| 2004 | 12 | 146 |
| 2003 | 9 | 148 |
| 2002 | 7 | 153 |
| 2001 | 7 | 148 |
| 2000 | 7 | 144 |
| 1999 | 7 | 144 |
| 1998 | 8 | 142 |
| 1997 | 7 | 148 |
| 1996 | 7 | 146 |
| 1995 | 6 | 146 |
| 1994 | 5 | 144 |
| 1993 | 5 | 136 |
| 1992 | 4 | 134 |
| 1991 | 7 | 126 |
| 1990 | 8 | 123 |
| 1989 | 6 | 106 |
| 1988 | 7 | 99 |
| 1987 | 7 | 96 |
| 1986 | 6 | 101 |