| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 86.6 | 55 |
| 2015 | 79.9 | 67 |
| 2014 | 73.5 | 70 |
| 2013 | 68.1 | 73 |
| 2012 | 64.4 | 74 |
| 2011 | 62.4 | 75 |
| 2010 | 58.5 | 77 |
| 2009 | 54.8 | 75 |
| 2008 | 51.6 | 76 |
| 2007 | 50 | 74 |
| 2006 | 48.5 | 74 |
| 2005 | 44.9 | 74 |
| 2004 | 40.9 | 75 |
| 2003 | 37.2 | 77 |
| 2002 | 34.3 | 78 |
| 2001 | 31.4 | 78 |
| 2000 | 29.7 | 78 |
| 1999 | 28.7 | 75 |
| 1998 | 27.9 | 75 |
| 1997 | 27.1 | 74 |
| 1996 | 25.8 | 73 |
| 1995 | 26 | 73 |
| 1994 | 25.4 | 68 |
| 1993 | 24.6 | 68 |
| 1992 | 22 | 66 |
| 1991 | 19.9 | 68 |
| 1990 | 19.5 | 65 |
| 1989 | 19.4 | 55 |
| 1988 | 19.3 | 55 |
| 1987 | 19.1 | 56 |
| 1986 | 18.7 | 56 |