| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 122.3 | 24 |
| 2015 | 204.7 | 19 |
| 2014 | 240.1 | 15 |
| 2013 | 210.9 | 18 |
| 2012 | 305.6 | 17 |
| 2011 | 243.7 | 18 |
| 2010 | 161.5 | 23 |
| 2009 | 139.7 | 25 |
| 2008 | 186.3 | 25 |
| 2007 | 135.6 | 34 |
| 2006 | 76.6 | 39 |
| 2005 | 75.3 | 35 |
| 2004 | 68.5 | 23 |
| 2003 | 40.6 | 31 |
| 2002 | 25.5 | 36 |
| 2001 | 42 | 28 |
| 2000 | 48.6 | 30 |
| 1999 | 87.6 | 20 |
| 1998 | 46.3 | 25 |
| 1997 | 52.7 | 18 |
| 1996 | 48.1 | 17 |
| 1995 | 29.6 | 23 |
| 1994 | 25.8 | 20 |
| 1993 | 10.3 | 31 |
| 1992 | 9.4 | 27 |
| 1991 | 8.2 | 29 |
| 1990 | 6.6 | 31 |
| 1989 | 12.8 | 21 |
| 1988 | 9.7 | 20 |
| 1987 | 8.9 | 18 |
| 1986 | 3.2 | 25 |