| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 76.5 | 125 |
| 2015 | 83.4 | 144 |
| 2014 | 83 | 144 |
| 2013 | 78.6 | 146 |
| 2012 | 75 | 146 |
| 2011 | 59.7 | 149 |
| 2010 | 51.2 | 149 |
| 2009 | 48.1 | 150 |
| 2008 | 47.5 | 151 |
| 2007 | 44.5 | 148 |
| 2006 | 29.9 | 154 |
| 2005 | 29.5 | 149 |
| 2004 | 37.1 | 141 |
| 2003 | 34.2 | 138 |
| 2002 | 30.2 | 138 |
| 2001 | 28.7 | 134 |
| 2000 | 31.3 | 130 |
| 1999 | 36.1 | 128 |
| 1998 | 37.9 | 124 |
| 1997 | 39.1 | 124 |
| 1996 | 40.7 | 120 |
| 1995 | 38.2 | 119 |
| 1994 | 34.9 | 115 |
| 1993 | 33.3 | 112 |
| 1992 | 33.2 | 110 |
| 1991 | 30.2 | 115 |
| 1990 | 27.3 | 117 |
| 1989 | 24 | 99 |
| 1988 | 24.8 | 95 |
| 1987 | 20.2 | 100 |
| 1986 | 18.6 | 99 |