| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 78.34 | 136 |
| 2015 | 85.53 | 139 |
| 2014 | 141.77 | 122 |
| 2013 | 140.86 | 125 |
| 2012 | 136.78 | 125 |
| 2011 | 144.26 | 122 |
| 2010 | 120.08 | 122 |
| 2009 | 95.94 | 127 |
| 2008 | 118.59 | 122 |
| 2007 | 83.95 | 130 |
| 2006 | 77.31 | 127 |
| 2005 | 60.87 | 134 |
| 2004 | 46.49 | 134 |
| 2003 | 34.96 | 140 |
| 2002 | 30.2 | 142 |
| 2001 | 27.94 | 139 |
| 2000 | 32.2 | 134 |
| 1999 | 23.54 | 143 |
| 1998 | 19.49 | 145 |
| 1997 | 23.23 | 141 |
| 1996 | 25.41 | 138 |
| 1995 | 21.16 | 140 |
| 1994 | 17.69 | 135 |
| 1993 | 19.19 | 133 |
| 1992 | 29.33 | 118 |
| 1991 | 27.25 | 122 |
| 1990 | 27.99 | 119 |
| 1989 | 23.9 | 111 |
| 1988 | 22.13 | 112 |
| 1987 | 22.98 | 105 |
| 1986 | 18.49 | 106 |