| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 99.6 | 20 |
| 2015 | 93.9 | 24 |
| 2014 | 96 | 25 |
| 2013 | 93.5 | 24 |
| 2012 | 91.7 | 24 |
| 2011 | 89.2 | 23 |
| 2010 | 81.1 | 24 |
| 2009 | 75.4 | 24 |
| 2008 | 74.5 | 24 |
| 2007 | 65.2 | 24 |
| 2006 | 58.3 | 23 |
| 2005 | 54.6 | 24 |
| 2004 | 50.4 | 23 |
| 2003 | 47.2 | 22 |
| 2002 | 45.3 | 21 |
| 2001 | 43.1 | 21 |
| 2000 | 43.3 | 22 |
| 1999 | 44.9 | 21 |
| 1998 | 44.7 | 21 |
| 1997 | 44.6 | 21 |
| 1996 | 41 | 24 |
| 1995 | 36.7 | 27 |
| 1994 | 28 | 30 |
| 1993 | 24.8 | 30 |
| 1992 | 23.3 | 31 |
| 1991 | 20.2 | 31 |
| 1990 | 16.7 | 37 |
| 1989 | 13.7 | 39 |
| 1988 | 11.5 | 39 |
| 1987 | 10.2 | 42 |
| 1986 | 10.1 | 37 |