| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 102.2 | 18 |
| 2015 | 104.1 | 19 |
| 2014 | 118.6 | 19 |
| 2013 | 101.6 | 23 |
| 2012 | 93.3 | 23 |
| 2011 | 86.5 | 24 |
| 2010 | 56.7 | 29 |
| 2009 | 52.8 | 28 |
| 2008 | 51.7 | 29 |
| 2007 | 39.5 | 37 |
| 2006 | 30.9 | 38 |
| 2005 | 29.2 | 38 |
| 2004 | 28 | 37 |
| 2003 | 22.1 | 40 |
| 2002 | 21 | 37 |
| 2001 | 20.9 | 37 |
| 2000 | 18.8 | 40 |
| 1999 | 18.3 | 39 |
| 1998 | 19.1 | 40 |
| 1997 | 17.5 | 46 |
| 1996 | 14.5 | 46 |
| 1995 | 12.3 | 48 |
| 1994 | 13.3 | 45 |
| 1993 | 12.8 | 43 |
| 1992 | 10.5 | 46 |
| 1991 | 5.7 | 53 |
| 1990 | 9 | 48 |
| 1989 | 8.5 | 49 |
| 1988 | 10.3 | 41 |
| 1987 | 12 | 39 |
| 1986 | 11.3 | 35 |