| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 47 | 119 |
| 2015 | 52 | 121 |
| 2014 | 43 | 134 |
| 2013 | 31 | 143 |
| 2012 | 31 | 144 |
| 2011 | 24 | 149 |
| 2010 | 21 | 147 |
| 2009 | 15 | 154 |
| 2008 | 14 | 156 |
| 2007 | 11 | 159 |
| 2006 | 11 | 156 |
| 2005 | 9 | 156 |
| 2004 | 7 | 159 |
| 2003 | 5 | 162 |
| 2002 | 4 | 161 |
| 2001 | 5 | 156 |
| 2000 | 5 | 152 |
| 1999 | 5 | 151 |
| 1998 | 6 | 147 |
| 1997 | 7 | 141 |
| 1996 | 7 | 139 |
| 1995 | 6 | 144 |
| 1994 | 6 | 138 |
| 1993 | 4 | 136 |
| 1992 | 3 | 148 |
| 1991 | 2 | 147 |
| 1990 | 2 | 146 |
| 1989 | 2 | 143 |
| 1988 | 2 | 143 |
| 1987 | 2 | 139 |
| 1986 | 2 | 140 |