| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 297.2 | 40 |
| 2015 | 279.5 | 45 |
| 2014 | 258.9 | 49 |
| 2013 | 258.5 | 49 |
| 2012 | 231.8 | 50 |
| 2011 | 235.4 | 49 |
| 2010 | 240.8 | 50 |
| 2009 | 217.5 | 50 |
| 2008 | 208.8 | 50 |
| 2007 | 197.1 | 49 |
| 2006 | 191.9 | 48 |
| 2005 | 178 | 49 |
| 2004 | 169.5 | 49 |
| 2003 | 167 | 49 |
| 2002 | 166.4 | 49 |
| 2001 | 157.9 | 49 |
| 2000 | 151.3 | 48 |
| 1999 | 125.1 | 48 |
| 1998 | 116.8 | 50 |
| 1997 | 107.2 | 50 |
| 1996 | 100.2 | 51 |
| 1995 | 84.4 | 55 |
| 1994 | 76 | 54 |
| 1993 | 77.4 | 54 |
| 1992 | 66.9 | 54 |
| 1991 | 65.3 | 53 |
| 1990 | 60.3 | 53 |
| 1989 | 54.5 | 46 |
| 1988 | 51.3 | 46 |
| 1987 | 54.6 | 45 |
| 1986 | 53.9 | 44 |