| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 241.1 | 12 |
| 2015 | 266.2 | 11 |
| 2014 | 262.6 | 13 |
| 2013 | 263.8 | 13 |
| 2012 | 261.1 | 13 |
| 2011 | 254.2 | 13 |
| 2010 | 222.9 | 13 |
| 2009 | 179 | 15 |
| 2008 | 198.9 | 14 |
| 2007 | 161.3 | 15 |
| 2006 | 141.6 | 15 |
| 2005 | 130.3 | 14 |
| 2004 | 116 | 13 |
| 2003 | 89.1 | 16 |
| 2002 | 76.5 | 17 |
| 2001 | 73.1 | 16 |
| 2000 | 78.8 | 17 |
| 1999 | 75.5 | 16 |
| 1998 | 76.7 | 17 |
| 1997 | 83.7 | 15 |
| 1996 | 79.5 | 16 |
| 1995 | 76.8 | 17 |
| 1994 | 70.6 | 17 |
| 1993 | 69.6 | 18 |
| 1992 | 72.1 | 16 |
| 1991 | 70.8 | 17 |
| 1990 | 66.1 | 17 |
| 1989 | 64.9 | 14 |
| 1988 | 54.4 | 16 |
| 1987 | 47.8 | 16 |
| 1986 | 48.2 | 13 |