| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2014 | 33 | 81 |
| 2013 | 33 | 80 |
| 2012 | 31 | 80 |
| 2011 | 33 | 76 |
| 2010 | 42 | 68 |
| 2009 | 38 | 68 |
| 2008 | 39 | 71 |
| 2007 | 37 | 66 |
| 2006 | 35 | 65 |
| 2005 | 32 | 62 |
| 2004 | 28 | 59 |
| 2003 | 13 | 77 |
| 2002 | 12 | 77 |
| 2001 | 10 | 77 |
| 2000 | 10 | 78 |
| 1999 | 9 | 79 |
| 1998 | 7 | 78 |
| 1997 | 6 | 79 |
| 1996 | 7 | 77 |
| 1995 | 7 | 69 |
| 1994 | 8 | 61 |
| 1993 | 7 | 62 |
| 1992 | 5 | 64 |
| 1991 | 4 | 65 |
| 1990 | 4 | 67 |
| 1989 | 8 | 50 |
| 1988 | 9 | 45 |
| 1987 | 9 | 43 |
| 1986 | 7 | 44 |