| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 11 | 125 |
| 2015 | 11 | 151 |
| 2014 | 10 | 156 |
| 2013 | 9 | 161 |
| 2012 | 8 | 164 |
| 2011 | 7 | 164 |
| 2010 | 6 | 166 |
| 2009 | 4 | 171 |
| 2008 | 2 | 177 |
| 2007 | 2 | 180 |
| 2006 | 2 | 180 |
| 2005 | 1 | 180 |
| 2004 | 1 | 181 |
| 2003 | 1 | 180 |
| 2002 | 1 | 179 |
| 2001 | 1 | 178 |
| 2000 | 1 | 176 |
| 1999 | 1 | 173 |
| 1998 | 1 | 173 |
| 1997 | 0 | 175 |
| 1996 | 0 | 174 |
| 1995 | 0 | 173 |
| 1994 | 0 | 154 |
| 1993 | 1 | 147 |
| 1992 | 1 | 142 |
| 1991 | 1 | 137 |
| 1990 | 1 | 135 |
| 1989 | 3 | 101 |
| 1988 | 4 | 97 |
| 1987 | 4 | 96 |
| 1986 | 3 | 96 |