| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2013 | 512.6 | 34 |
| 2012 | 496.1 | 34 |
| 2011 | 466.8 | 36 |
| 2010 | 440.7 | 36 |
| 2009 | 431.5 | 37 |
| 2008 | 425 | 37 |
| 2007 | 405.6 | 37 |
| 2006 | 356.6 | 38 |
| 2005 | 325.3 | 38 |
| 2004 | 293.9 | 38 |
| 2003 | 257.3 | 40 |
| 2002 | 243.5 | 40 |
| 2001 | 249.7 | 39 |
| 2000 | 233.5 | 40 |
| 1999 | 224.1 | 39 |
| 1998 | 242.3 | 37 |
| 1997 | 249.9 | 37 |
| 1996 | 157.9 | 43 |
| 1995 | 170.8 | 41 |
| 1994 | 166.5 | 40 |
| 1993 | 176.9 | 39 |
| 1992 | 186.7 | 37 |
| 1991 | 187.1 | 37 |
| 1990 | 162.5 | 37 |
| 1989 | 154.7 | 31 |
| 1988 | 158.3 | 31 |
| 1987 | 142.7 | 31 |
| 1986 | 138 | 30 |