| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 1 | 150 |
| 2014 | 1 | 162 |
| 2013 | 1 | 171 |
| 2012 | 1 | 171 |
| 2011 | 1 | 173 |
| 2010 | 1 | 171 |
| 2009 | 1 | 172 |
| 2008 | 1 | 172 |
| 2007 | 1 | 170 |
| 2006 | 1 | 163 |
| 2005 | 1 | 161 |
| 2004 | 0 | 155 |
| 1999 | 0 | 146 |
| 1998 | 0 | 146 |
| 1997 | 0 | 142 |
| 1996 | 0 | 143 |
| 1995 | 0 | 141 |
| 1994 | 0 | 140 |
| 1993 | 0 | 134 |
| 1992 | 0 | 123 |
| 1991 | 0 | 126 |
| 1990 | 0 | 128 |
| 1989 | 0 | 130 |
| 1988 | 0 | 128 |
| 1987 | 0 | 129 |
| 1986 | 0 | 128 |