| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 18 | 89 |
| 2015 | 17 | 104 |
| 2014 | 19 | 104 |
| 2013 | 16 | 109 |
| 2012 | 16 | 109 |
| 2011 | 12 | 112 |
| 2010 | 10 | 113 |
| 2009 | 10 | 110 |
| 2008 | 13 | 110 |
| 2007 | 9 | 118 |
| 2006 | 8 | 115 |
| 2005 | 8 | 111 |
| 2004 | 7 | 116 |
| 2003 | 6 | 118 |
| 2002 | 6 | 114 |
| 2001 | 5 | 116 |
| 2000 | 5 | 116 |
| 1999 | 6 | 112 |
| 1998 | 6 | 116 |
| 1997 | 6 | 110 |
| 1996 | 6 | 107 |
| 1995 | 5 | 110 |
| 1994 | 3 | 108 |
| 1993 | 5 | 98 |
| 1992 | 6 | 88 |
| 1991 | 5 | 96 |
| 1990 | 5 | 91 |
| 1989 | 4 | 81 |
| 1988 | 5 | 80 |
| 1987 | 4 | 78 |
| 1986 | 4 | 76 |