| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 123.2 | 22 |
| 2015 | 115.1 | 29 |
| 2014 | 67.4 | 37 |
| 2013 | 124.5 | 26 |
| 2012 | 84.7 | 36 |
| 2011 | 87.3 | 38 |
| 2010 | 55.1 | 46 |
| 2009 | 44.4 | 47 |
| 2008 | 108.7 | 32 |
| 2007 | 88 | 43 |
| 2006 | 153 | 27 |
| 2005 | 48.2 | 43 |
| 2004 | 29.5 | 41 |
| 2003 | 33.2 | 35 |
| 2002 | 15.8 | 45 |
| 2001 | 17.7 | 40 |
| 2000 | 80.5 | 26 |
| 1999 | 41.5 | 28 |
| 1998 | 17.4 | 40 |
| 1997 | 16.3 | 41 |
| 1996 | 14 | 38 |
| 1995 | 13.5 | 35 |
| 1994 | 4.4 | 49 |
| 1993 | 6 | 41 |
| 1992 | 5.9 | 36 |
| 1991 | 3.5 | 38 |
| 1990 | 1.5 | 49 |
| 1989 | 1.6 | 44 |
| 1988 | 2.7 | 35 |
| 1987 | 2.2 | 31 |
| 1986 | 1.4 | 34 |