| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 44 | 70 |
| 2014 | 46 | 73 |
| 2013 | 45 | 73 |
| 2012 | 45 | 69 |
| 2011 | 44 | 69 |
| 2010 | 43 | 66 |
| 2009 | 37 | 68 |
| 2008 | 39 | 69 |
| 2007 | 34 | 69 |
| 2006 | 29 | 68 |
| 2005 | 25 | 68 |
| 2004 | 20 | 65 |
| 2003 | 17 | 64 |
| 2002 | 16 | 63 |
| 2001 | 15 | 60 |
| 2000 | 15 | 63 |
| 1999 | 15 | 58 |
| 1998 | 16 | 54 |
| 1997 | 12 | 60 |
| 1996 | 13 | 56 |
| 1995 | 14 | 50 |
| 1994 | 12 | 53 |
| 1993 | 11 | 49 |
| 1992 | 12 | 44 |
| 1991 | 10 | 48 |
| 1990 | 11 | 44 |
| 1989 | 10 | 47 |
| 1988 | 12 | 40 |
| 1987 | 11 | 40 |
| 1986 | 10 | 40 |