| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 10 | 137 |
| 2015 | 9 | 164 |
| 2014 | 10 | 167 |
| 2013 | 9 | 171 |
| 2012 | 9 | 171 |
| 2011 | 9 | 171 |
| 2010 | 8 | 170 |
| 2009 | 8 | 169 |
| 2008 | 6 | 172 |
| 2007 | 5 | 173 |
| 2006 | 6 | 169 |
| 2005 | 4 | 171 |
| 2004 | 2 | 178 |
| 2003 | 2 | 176 |
| 2002 | 1 | 178 |
| 2001 | 1 | 174 |
| 2000 | 1 | 174 |
| 1999 | 1 | 174 |
| 1998 | 2 | 169 |
| 1997 | 1 | 171 |
| 1996 | 1 | 171 |
| 1995 | 3 | 161 |
| 1994 | 3 | 155 |
| 1993 | 3 | 152 |
| 1992 | 3 | 142 |
| 1991 | 3 | 141 |
| 1990 | 3 | 139 |
| 1989 | 3 | 120 |
| 1988 | 3 | 116 |
| 1987 | 3 | 116 |
| 1986 | 3 | 118 |