| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 15 | 101 |
| 2014 | 16 | 105 |
| 2013 | 18 | 100 |
| 2012 | 18 | 95 |
| 2011 | 16 | 98 |
| 2010 | 16 | 94 |
| 2009 | 19 | 83 |
| 2008 | 20 | 82 |
| 2007 | 17 | 85 |
| 2006 | 14 | 87 |
| 2005 | 13 | 86 |
| 2004 | 10 | 85 |
| 2003 | 8 | 85 |
| 2002 | 9 | 82 |
| 2001 | 12 | 68 |
| 2000 | 11 | 74 |
| 1999 | 12 | 66 |
| 1998 | 13 | 64 |
| 1997 | 12 | 64 |
| 1996 | 15 | 55 |
| 1995 | 15 | 50 |
| 1994 | 15 | 50 |
| 1993 | 12 | 49 |
| 1992 | 12 | 46 |
| 1991 | 12 | 44 |
| 1990 | 11 | 43 |
| 1989 | 9 | 46 |
| 1988 | 8 | 47 |
| 1987 | 8 | 45 |
| 1986 | 8 | 42 |