| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 273.3 | 42 |
| 2015 | 237.4 | 51 |
| 2014 | 219.5 | 54 |
| 2013 | 216.3 | 55 |
| 2012 | 196.5 | 56 |
| 2011 | 183.1 | 55 |
| 2010 | 183 | 55 |
| 2009 | 184.1 | 53 |
| 2008 | 163.4 | 53 |
| 2007 | 164.9 | 53 |
| 2006 | 166.7 | 51 |
| 2005 | 112.4 | 57 |
| 2004 | 110.6 | 56 |
| 2003 | 109 | 55 |
| 2002 | 101.7 | 55 |
| 2001 | 88.4 | 59 |
| 2000 | 93.7 | 56 |
| 1999 | 87.1 | 55 |
| 1998 | 93.6 | 54 |
| 1997 | 87.6 | 55 |
| 1996 | 95.6 | 52 |
| 1995 | 89.5 | 54 |
| 1994 | 84.9 | 51 |
| 1993 | 94.5 | 51 |
| 1992 | 80.3 | 53 |
| 1991 | 87.1 | 51 |
| 1990 | 87.6 | 50 |
| 1989 | 90.4 | 41 |
| 1988 | 75.1 | 43 |
| 1987 | 72 | 43 |
| 1986 | 63.6 | 43 |