| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2014 | 16 | 111 |
| 2013 | 16 | 113 |
| 2012 | 15 | 110 |
| 2011 | 18 | 104 |
| 2010 | 19 | 93 |
| 2009 | 17 | 93 |
| 2008 | 20 | 90 |
| 2007 | 17 | 94 |
| 2006 | 16 | 88 |
| 2005 | 14 | 87 |
| 2004 | 12 | 78 |
| 2003 | 9 | 82 |
| 2002 | 9 | 79 |
| 2001 | 8 | 81 |
| 2000 | 8 | 80 |
| 1999 | 7 | 84 |
| 1998 | 7 | 86 |
| 1997 | 6 | 85 |
| 1996 | 6 | 85 |
| 1995 | 6 | 76 |
| 1994 | 6 | 72 |
| 1993 | 6 | 73 |
| 1992 | 6 | 65 |
| 1991 | 5 | 65 |
| 1990 | 5 | 67 |
| 1989 | 6 | 57 |
| 1988 | 5 | 54 |
| 1987 | 5 | 51 |
| 1986 | 3 | 66 |