| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 78 | 62 |
| 2014 | 75 | 64 |
| 2013 | 75 | 62 |
| 2012 | 72 | 62 |
| 2011 | 64 | 63 |
| 2010 | 59 | 61 |
| 2009 | 47 | 64 |
| 2008 | 56 | 64 |
| 2007 | 42 | 64 |
| 2006 | 33 | 64 |
| 2005 | 30 | 64 |
| 2004 | 26 | 61 |
| 2003 | 25 | 56 |
| 2002 | 23 | 54 |
| 2001 | 23 | 51 |
| 2000 | 22 | 49 |
| 1999 | 21 | 48 |
| 1998 | 23 | 48 |
| 1997 | 22 | 47 |
| 1996 | 20 | 46 |
| 1995 | 18 | 46 |
| 1994 | 15 | 46 |
| 1993 | 13 | 45 |
| 1992 | 13 | 43 |
| 1991 | 12 | 44 |
| 1990 | 11 | 45 |
| 1989 | 11 | 44 |
| 1988 | 11 | 43 |
| 1987 | 11 | 41 |
| 1986 | 9 | 41 |