| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 24 | 136 |
| 2015 | 23 | 145 |
| 2014 | 28 | 147 |
| 2013 | 28 | 147 |
| 2012 | 24 | 148 |
| 2011 | 24 | 147 |
| 2010 | 22 | 146 |
| 2009 | 20 | 146 |
| 2008 | 22 | 146 |
| 2007 | 14 | 153 |
| 2006 | 12 | 152 |
| 2005 | 12 | 148 |
| 2004 | 9 | 152 |
| 2003 | 8 | 150 |
| 2002 | 7 | 146 |
| 2001 | 6 | 152 |
| 2000 | 5 | 154 |
| 1999 | 7 | 143 |
| 1998 | 5 | 151 |
| 1997 | 8 | 135 |
| 1996 | 6 | 149 |
| 1995 | 5 | 150 |
| 1994 | 5 | 144 |
| 1993 | 5 | 125 |
| 1992 | 7 | 117 |
| 1991 | 7 | 111 |
| 1990 | 6 | 122 |
| 1989 | 5 | 119 |
| 1988 | 4 | 125 |
| 1987 | 3 | 131 |
| 1986 | 3 | 133 |