| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 22 | 143 |
| 2015 | 26 | 143 |
| 2014 | 31 | 146 |
| 2013 | 30 | 146 |
| 2012 | 28 | 145 |
| 2011 | 33 | 139 |
| 2010 | 24 | 143 |
| 2009 | 20 | 147 |
| 2008 | 20 | 149 |
| 2007 | 18 | 147 |
| 2006 | 14 | 149 |
| 2005 | 10 | 154 |
| 2004 | 10 | 150 |
| 2003 | 8 | 149 |
| 2002 | 16 | 119 |
| 2001 | 7 | 146 |
| 2000 | 3 | 168 |
| 1999 | 3 | 168 |
| 1998 | 4 | 163 |
| 1997 | 3 | 165 |
| 1996 | 3 | 163 |
| 1995 | 4 | 160 |
| 1994 | 2 | 171 |
| 1993 | 2 | 152 |
| 1992 | 2 | 149 |
| 1991 | 2 | 140 |
| 1990 | 3 | 136 |
| 1989 | 2 | 136 |
| 1988 | 2 | 137 |
| 1987 | 2 | 138 |
| 1986 | 2 | 136 |