| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 53.2 | 31 |
| 2015 | 53.9 | 33 |
| 2014 | 65.6 | 32 |
| 2013 | 65.3 | 31 |
| 2012 | 62.4 | 30 |
| 2011 | 63.2 | 30 |
| 2010 | 58.9 | 28 |
| 2009 | 50.6 | 29 |
| 2008 | 60.2 | 27 |
| 2007 | 63.9 | 25 |
| 2006 | 55.8 | 24 |
| 2005 | 55.2 | 23 |
| 2004 | 55.1 | 21 |
| 2003 | 53.1 | 20 |
| 2002 | 43.5 | 22 |
| 2001 | 41.3 | 22 |
| 2000 | 47.9 | 20 |
| 1999 | 51.5 | 19 |
| 1998 | 51.3 | 19 |
| 1997 | 52 | 19 |
| 1996 | 62 | 19 |
| 1995 | 57.3 | 19 |
| 1994 | 51.5 | 19 |
| 1993 | 50.1 | 19 |
| 1992 | 64.2 | 17 |
| 1991 | 62.2 | 18 |
| 1990 | 61.7 | 18 |
| 1989 | 50.3 | 19 |
| 1988 | 49.2 | 18 |
| 1987 | 44.7 | 17 |
| 1986 | 35.8 | 15 |