| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 219.2 | 55 |
| 2014 | 219.1 | 55 |
| 2013 | 221.3 | 53 |
| 2012 | 219.6 | 52 |
| 2011 | 221 | 50 |
| 2010 | 223.6 | 51 |
| 2009 | 218.7 | 49 |
| 2008 | 215 | 49 |
| 2007 | 209.6 | 48 |
| 2006 | 189.8 | 49 |
| 2005 | 175.9 | 50 |
| 2004 | 159.3 | 50 |
| 2003 | 146.7 | 50 |
| 2002 | 136.8 | 50 |
| 2001 | 131.4 | 51 |
| 2000 | 127.2 | 50 |
| 1999 | 123.4 | 49 |
| 1998 | 117.4 | 49 |
| 1997 | 117.3 | 48 |
| 1996 | 114.2 | 48 |
| 1995 | 109.8 | 49 |
| 1994 | 110.5 | 47 |
| 1993 | 112.7 | 47 |
| 1992 | 113.9 | 46 |
| 1991 | 120.2 | 45 |
| 1990 | 134.2 | 39 |
| 1989 | 134.8 | 32 |
| 1988 | 134.3 | 33 |
| 1987 | 129 | 34 |
| 1986 | 132.3 | 31 |