| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 93.4 | 22 |
| 2015 | 102.1 | 20 |
| 2014 | 103.5 | 22 |
| 2013 | 92.8 | 25 |
| 2012 | 89.9 | 25 |
| 2011 | 94.6 | 22 |
| 2010 | 87.9 | 22 |
| 2009 | 79 | 23 |
| 2008 | 93.5 | 22 |
| 2007 | 85.9 | 20 |
| 2006 | 66.2 | 22 |
| 2005 | 59 | 22 |
| 2004 | 47.8 | 25 |
| 2003 | 41.5 | 24 |
| 2002 | 37.8 | 24 |
| 2001 | 36.3 | 23 |
| 2000 | 31.5 | 26 |
| 1999 | 32.3 | 28 |
| 1998 | 34.9 | 25 |
| 1997 | 31.9 | 30 |
| 1996 | 30.8 | 31 |
| 1995 | 27.2 | 31 |
| 1994 | 22.5 | 32 |
| 1993 | 21.2 | 33 |
| 1992 | 18.8 | 37 |
| 1991 | 17.2 | 33 |
| 1990 | 15.4 | 40 |