| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 149 | 59 |
| 2015 | 139 | 70 |
| 2014 | 128 | 79 |
| 2013 | 111 | 86 |
| 2012 | 87 | 91 |
| 2011 | 70 | 97 |
| 2010 | 58 | 98 |
| 2009 | 54 | 95 |
| 2008 | 50 | 100 |
| 2007 | 39 | 105 |
| 2006 | 34 | 102 |
| 2005 | 31 | 97 |
| 2004 | 29 | 96 |
| 2003 | 26 | 89 |
| 2002 | 23 | 90 |
| 2001 | 24 | 86 |
| 2000 | 27 | 87 |
| 1999 | 27 | 81 |
| 1998 | 24 | 81 |
| 1997 | 23 | 87 |
| 1996 | 22 | 82 |
| 1995 | 22 | 83 |
| 1994 | 21 | 69 |
| 1993 | 20 | 68 |
| 1992 | 17 | 73 |
| 1991 | 15 | 75 |
| 1990 | 12 | 79 |
| 1989 | 12 | 66 |
| 1988 | 13 | 65 |
| 1987 | 17 | 54 |
| 1986 | 17 | 52 |