| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 71 | 94 |
| 2014 | 89 | 93 |
| 2013 | 91 | 93 |
| 2012 | 82 | 94 |
| 2011 | 81 | 90 |
| 2010 | 65 | 93 |
| 2009 | 46 | 102 |
| 2008 | 56 | 97 |
| 2007 | 45 | 99 |
| 2006 | 39 | 96 |
| 2005 | 22 | 107 |
| 2004 | 16 | 113 |
| 2003 | 12 | 114 |
| 2002 | 10 | 115 |
| 2001 | 10 | 118 |
| 2000 | 8 | 121 |
| 1999 | 8 | 121 |
| 1998 | 10 | 113 |
| 1997 | 14 | 99 |
| 1996 | 12 | 101 |
| 1995 | 13 | 96 |
| 1994 | 14 | 80 |
| 1993 | 12 | 83 |
| 1992 | 14 | 77 |
| 1991 | 16 | 73 |
| 1990 | 15 | 73 |
| 1989 | 19 | 56 |
| 1988 | 16 | 56 |
| 1987 | 9 | 71 |
| 1986 | 7 | 74 |