| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 70.3 | 61 |
| 2015 | 68.7 | 71 |
| 2014 | 67.2 | 72 |
| 2013 | 65.3 | 75 |
| 2012 | 63.2 | 75 |
| 2011 | 63.1 | 74 |
| 2010 | 62.5 | 75 |
| 2009 | 60 | 74 |
| 2008 | 56.6 | 73 |
| 2007 | 53.8 | 70 |
| 2006 | 52.6 | 71 |
| 2005 | 51 | 69 |
| 2004 | 50.6 | 69 |
| 2003 | 50.1 | 68 |
| 2002 | 49.2 | 68 |
| 2001 | 48.1 | 68 |
| 2000 | 46.1 | 68 |
| 1999 | 45.3 | 65 |
| 1998 | 44.3 | 65 |
| 1997 | 43.1 | 65 |
| 1996 | 41.1 | 65 |
| 1995 | 41.2 | 65 |
| 1994 | 41.2 | 61 |
| 1993 | 40.2 | 61 |
| 1992 | 38.3 | 61 |
| 1991 | 37.1 | 60 |
| 1990 | 36.6 | 58 |
| 1989 | 35.9 | 49 |
| 1988 | 34.7 | 49 |
| 1987 | 33.7 | 49 |
| 1986 | 33 | 48 |