| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 57 | 70 |
| 2014 | 55 | 69 |
| 2013 | 50 | 69 |
| 2012 | 40 | 71 |
| 2011 | 34 | 74 |
| 2010 | 31 | 73 |
| 2009 | 33 | 72 |
| 2008 | 32 | 73 |
| 2007 | 27 | 73 |
| 2006 | 22 | 75 |
| 2005 | 19 | 75 |
| 2004 | 17 | 73 |
| 2003 | 14 | 72 |
| 2002 | 11 | 79 |
| 2001 | 10 | 78 |
| 2000 | 11 | 70 |
| 1999 | 13 | 63 |
| 1998 | 14 | 60 |
| 1997 | 12 | 63 |
| 1996 | 12 | 64 |
| 1995 | 7 | 66 |
| 1994 | 8 | 63 |
| 1993 | 6 | 68 |
| 1992 | 7 | 56 |
| 1991 | 7 | 52 |
| 1990 | 7 | 53 |
| 1989 | 8 | 52 |
| 1988 | 8 | 48 |
| 1987 | 7 | 50 |
| 1986 | 6 | 50 |