| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 4 | 179 |
| 2015 | 4 | 182 |
| 2014 | 4 | 183 |
| 2013 | 4 | 185 |
| 2012 | 3 | 185 |
| 2011 | 3 | 181 |
| 2010 | 3 | 180 |
| 2009 | 2 | 185 |
| 2008 | 3 | 184 |
| 2007 | 3 | 182 |
| 2006 | 3 | 178 |
| 2005 | 2 | 178 |
| 2004 | 2 | 179 |
| 2003 | 2 | 179 |
| 2002 | 1 | 178 |
| 2001 | 1 | 178 |
| 2000 | 1 | 183 |
| 1999 | 1 | 180 |
| 1998 | 1 | 181 |
| 1997 | 1 | 181 |
| 1996 | 1 | 181 |
| 1995 | 1 | 182 |
| 1994 | 1 | 183 |
| 1993 | 1 | 163 |
| 1992 | 1 | 162 |
| 1991 | 1 | 157 |
| 1990 | 1 | 160 |
| 1989 | 1 | 157 |
| 1988 | 1 | 157 |
| 1987 | 1 | 159 |
| 1986 | 0 | 159 |