| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 28 | 135 |
| 2015 | 34 | 134 |
| 2014 | 55 | 126 |
| 2013 | 56 | 125 |
| 2012 | 69 | 113 |
| 2011 | 65 | 115 |
| 2010 | 52 | 112 |
| 2009 | 52 | 104 |
| 2008 | 38 | 127 |
| 2007 | 28 | 134 |
| 2006 | 20 | 133 |
| 2005 | 13 | 144 |
| 2004 | 11 | 145 |
| 2003 | 9 | 143 |
| 2002 | 5 | 156 |
| 2001 | 8 | 139 |
| 2000 | 5 | 161 |
| 1999 | 4 | 160 |
| 1998 | 3 | 166 |
| 1997 | 4 | 162 |
| 1996 | 3 | 166 |
| 1995 | 1 | 179 |
| 1994 | 0 | 187 |
| 1993 | 1 | 170 |
| 1992 | 1 | 167 |
| 1991 | 1 | 153 |
| 1990 | 1 | 162 |
| 1989 | 1 | 161 |
| 1988 | 1 | 160 |
| 1987 | 1 | 160 |
| 1986 | 1 | 158 |