| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 95.8 | 119 |
| 2015 | 108.7 | 131 |
| 2014 | 137.9 | 128 |
| 2013 | 126.1 | 135 |
| 2012 | 104.7 | 138 |
| 2011 | 101.8 | 137 |
| 2010 | 83.5 | 136 |
| 2009 | 76.5 | 137 |
| 2008 | 85.2 | 136 |
| 2007 | 63 | 138 |
| 2006 | 63 | 133 |
| 2005 | 42.8 | 140 |
| 2004 | 32.7 | 145 |
| 2003 | 33.3 | 140 |
| 2002 | 21.9 | 143 |
| 2001 | 21.2 | 138 |
| 2000 | 20.4 | 137 |
| 1999 | 20.4 | 139 |
| 1998 | 18.8 | 141 |
| 1997 | 19.6 | 144 |
| 1996 | 23.2 | 137 |
| 1995 | 20.9 | 135 |
| 1994 | 20.5 | 128 |
| 1993 | 17 | 131 |
| 1992 | 22.2 | 124 |
| 1991 | 23.5 | 124 |
| 1990 | 18.8 | 127 |
| 1989 | 20.6 | 106 |
| 1988 | 22.1 | 100 |
| 1987 | 22.3 | 98 |
| 1986 | 21.1 | 96 |