| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 101.1 | 19 |
| 2015 | 96.1 | 22 |
| 2014 | 85 | 27 |
| 2013 | 80.3 | 27 |
| 2012 | 78.2 | 26 |
| 2011 | 70.2 | 27 |
| 2010 | 60.7 | 26 |
| 2009 | 54.9 | 27 |
| 2008 | 58.8 | 28 |
| 2007 | 53.5 | 27 |
| 2006 | 50 | 27 |
| 2005 | 46 | 27 |
| 2004 | 41.8 | 27 |
| 2003 | 36.7 | 27 |
| 2002 | 31.7 | 27 |
| 2001 | 30.2 | 30 |
| 2000 | 30.8 | 27 |
| 1999 | 32.7 | 26 |
| 1998 | 33.7 | 28 |
| 1997 | 35.1 | 23 |
| 1996 | 38.2 | 26 |
| 1995 | 37.7 | 25 |
| 1994 | 33.7 | 27 |
| 1993 | 35.9 | 22 |
| 1992 | 34.3 | 26 |
| 1991 | 32.6 | 24 |
| 1990 | 28.5 | 26 |
| 1989 | 27.7 | 24 |
| 1988 | 27.9 | 22 |
| 1987 | 25.3 | 25 |
| 1986 | 23.6 | 23 |