| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 314 | 41 |
| 2014 | 305.8 | 41 |
| 2013 | 296.6 | 42 |
| 2012 | 291 | 43 |
| 2011 | 291.6 | 43 |
| 2010 | 286.5 | 42 |
| 2009 | 281.2 | 43 |
| 2008 | 282.5 | 41 |
| 2007 | 271.7 | 40 |
| 2006 | 259.3 | 42 |
| 2005 | 249.5 | 42 |
| 2004 | 232.8 | 42 |
| 2003 | 222.2 | 42 |
| 2002 | 212.2 | 42 |
| 2001 | 208.7 | 42 |
| 2000 | 200.5 | 42 |
| 1999 | 198 | 41 |
| 1998 | 194.6 | 41 |
| 1997 | 191.4 | 41 |
| 1996 | 185.8 | 40 |
| 1995 | 183.3 | 40 |
| 1994 | 176.8 | 39 |
| 1993 | 177 | 38 |
| 1992 | 174.2 | 38 |
| 1991 | 172.2 | 38 |
| 1990 | 173.9 | 36 |
| 1989 | 172.1 | 29 |
| 1988 | 163.5 | 29 |
| 1987 | 163.5 | 29 |
| 1986 | 161.4 | 28 |