| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 127 | 97 |
| 2014 | 141 | 96 |
| 2013 | 129 | 98 |
| 2012 | 114 | 98 |
| 2011 | 115 | 97 |
| 2010 | 102 | 97 |
| 2009 | 101 | 94 |
| 2008 | 102 | 96 |
| 2007 | 89 | 93 |
| 2006 | 76 | 92 |
| 2005 | 73 | 91 |
| 2004 | 72 | 88 |
| 2003 | 60 | 86 |
| 2002 | 46 | 92 |
| 2001 | 40 | 92 |
| 2000 | 36 | 94 |
| 1999 | 42 | 87 |
| 1998 | 41 | 87 |
| 1997 | 40 | 87 |
| 1996 | 42 | 81 |
| 1995 | 37 | 84 |
| 1994 | 38 | 68 |
| 1993 | 60 | 53 |
| 1992 | 52 | 53 |
| 1991 | 56 | 46 |
| 1990 | 50 | 52 |
| 1989 | 48 | 42 |
| 1988 | 56 | 43 |
| 1987 | 54 | 43 |
| 1986 | 45 | 41 |