| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 35 | 128 |
| 2015 | 37 | 132 |
| 2014 | 37 | 139 |
| 2013 | 36 | 139 |
| 2012 | 32 | 140 |
| 2011 | 30 | 141 |
| 2010 | 31 | 136 |
| 2009 | 21 | 144 |
| 2008 | 23 | 143 |
| 2007 | 17 | 150 |
| 2006 | 16 | 146 |
| 2005 | 15 | 140 |
| 2004 | 13 | 142 |
| 2003 | 12 | 139 |
| 2002 | 11 | 129 |
| 2001 | 10 | 132 |
| 2000 | 10 | 130 |
| 1999 | 10 | 128 |
| 1998 | 8 | 136 |
| 1997 | 6 | 145 |
| 1996 | 7 | 142 |
| 1995 | 7 | 141 |
| 1994 | 3 | 161 |
| 1993 | 4 | 141 |
| 1992 | 3 | 146 |
| 1991 | 4 | 129 |
| 1990 | 3 | 132 |
| 1989 | 3 | 132 |
| 1988 | 3 | 131 |
| 1987 | 4 | 122 |
| 1986 | 4 | 121 |