| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 12 | 110 |
| 2014 | 12 | 115 |
| 2013 | 11 | 116 |
| 2012 | 11 | 114 |
| 2011 | 11 | 113 |
| 2010 | 9 | 113 |
| 2009 | 8 | 113 |
| 2008 | 11 | 108 |
| 2007 | 9 | 107 |
| 2006 | 8 | 101 |
| 2005 | 9 | 95 |
| 2004 | 7 | 93 |
| 2003 | 6 | 93 |
| 2002 | 5 | 94 |
| 2001 | 4 | 93 |
| 2000 | 4 | 93 |
| 1999 | 5 | 86 |
| 1998 | 5 | 84 |
| 1997 | 6 | 81 |
| 1996 | 6 | 80 |
| 1995 | 5 | 76 |
| 1994 | 5 | 73 |
| 1993 | 4 | 71 |
| 1992 | 4 | 68 |
| 1991 | 4 | 69 |
| 1990 | 4 | 65 |
| 1989 | 3 | 66 |
| 1988 | 2 | 73 |
| 1987 | 2 | 73 |
| 1986 | 2 | 65 |