| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 62 | 107 |
| 2015 | 63 | 122 |
| 2014 | 66 | 125 |
| 2013 | 59 | 132 |
| 2012 | 48 | 138 |
| 2011 | 36 | 142 |
| 2010 | 27 | 142 |
| 2009 | 23 | 145 |
| 2008 | 24 | 146 |
| 2007 | 20 | 147 |
| 2006 | 16 | 147 |
| 2005 | 13 | 150 |
| 2004 | 11 | 153 |
| 2003 | 7 | 154 |
| 2002 | 6 | 154 |
| 2001 | 7 | 147 |
| 2000 | 8 | 143 |
| 1999 | 6 | 147 |
| 1998 | 6 | 148 |
| 1997 | 7 | 145 |
| 1996 | 8 | 143 |
| 1995 | 7 | 144 |
| 1994 | 6 | 138 |
| 1993 | 4 | 138 |
| 1992 | 3 | 143 |
| 1991 | 3 | 144 |
| 1990 | 2 | 143 |
| 1989 | 2 | 122 |
| 1988 | 2 | 120 |
| 1987 | 2 | 123 |
| 1986 | 1 | 122 |