| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 103.7 | 115 |
| 2015 | 117 | 127 |
| 2014 | 150.8 | 124 |
| 2013 | 136.6 | 128 |
| 2012 | 128.2 | 128 |
| 2011 | 125.1 | 128 |
| 2010 | 113.7 | 125 |
| 2009 | 98.9 | 128 |
| 2008 | 98.2 | 129 |
| 2007 | 82.7 | 129 |
| 2006 | 74.8 | 125 |
| 2005 | 59.7 | 131 |
| 2004 | 44 | 137 |
| 2003 | 36.7 | 136 |
| 2002 | 39.9 | 129 |
| 2001 | 23.1 | 137 |
| 2000 | 16.3 | 145 |
| 1999 | 17.5 | 143 |
| 1998 | 19.4 | 140 |
| 1997 | 17.3 | 147 |
| 1996 | 17.9 | 145 |
| 1995 | 16.2 | 144 |
| 1994 | 14 | 139 |
| 1993 | 17 | 132 |
| 1992 | 21.4 | 126 |
| 1991 | 21.1 | 128 |
| 1990 | 19.9 | 125 |
| 1989 | 16.9 | 109 |
| 1988 | 17.1 | 106 |
| 1987 | 14.1 | 107 |
| 1986 | 13 | 108 |