| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 141.9 | 20 |
| 2015 | 140.7 | 24 |
| 2014 | 197.8 | 19 |
| 2013 | 8 | 94 |
| 2012 | 73.6 | 40 |
| 2011 | 184.9 | 24 |
| 2010 | 184 | 21 |
| 2009 | 140.3 | 24 |
| 2008 | 145.7 | 28 |
| 2007 | 250.3 | 24 |
| 2006 | 214.7 | 20 |
| 2005 | 110.4 | 24 |
| 2004 | 138.7 | 16 |
| 2003 | 53.7 | 25 |
| 2002 | 40.9 | 27 |
| 2001 | 56.8 | 23 |
| 2000 | 93.4 | 23 |
| 1999 | 72.7 | 21 |
| 1998 | 63.7 | 20 |
| 1997 | 49.1 | 20 |
| 1996 | 45 | 18 |
| 1995 | 36.6 | 21 |
| 1994 | 18.8 | 27 |
| 1993 | 17.2 | 19 |
| 1992 | 6.8 | 34 |
| 1991 | 2.9 | 40 |
| 1990 | 0.9 | 60 |
| 1989 | 0.1 | 91 |
| 1988 | 0.2 | 82 |
| 1987 | 0.1 | 86 |
| 1986 | 0.2 | 70 |