| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 267.4 | 17 |
| 2015 | 331.8 | 16 |
| 2014 | 275.1 | 13 |
| 2013 | 475.4 | 14 |
| 2012 | 210.6 | 23 |
| 2011 | 247.1 | 17 |
| 2010 | 272.6 | 19 |
| 2009 | 181.1 | 19 |
| 2008 | 293.8 | 18 |
| 2007 | 324.6 | 22 |
| 2006 | 211.5 | 21 |
| 2005 | 260.2 | 13 |
| 2004 | 249.2 | 9 |
| 2003 | 182.2 | 13 |
| 2002 | 240.6 | 10 |
| 2001 | 300.6 | 8 |
| 2000 | 183.8 | 15 |
| 1999 | 138.8 | 16 |
| 1998 | 127.6 | 12 |
| 1997 | 128.3 | 7 |
| 1996 | 91.9 | 10 |
| 1995 | 95.3 | 10 |
| 1994 | 109.7 | 4 |
| 1993 | 43.9 | 10 |
| 1992 | 43.9 | 11 |
| 1991 | 47.4 | 9 |
| 1990 | 25.5 | 14 |
| 1989 | 27.9 | 11 |
| 1988 | 20.1 | 12 |
| 1987 | 11.8 | 14 |
| 1986 | 20.4 | 10 |