| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 96.01 | 131 |
| 2015 | 108.89 | 131 |
| 2014 | 139.22 | 124 |
| 2013 | 129.5 | 127 |
| 2012 | 123.68 | 128 |
| 2011 | 121.56 | 130 |
| 2010 | 106.58 | 128 |
| 2009 | 92.53 | 129 |
| 2008 | 103.52 | 126 |
| 2007 | 86.39 | 129 |
| 2006 | 74.22 | 128 |
| 2005 | 66.47 | 125 |
| 2004 | 44.15 | 137 |
| 2003 | 27.37 | 148 |
| 2002 | 19.88 | 149 |
| 2001 | 17.09 | 149 |
| 2000 | 13.85 | 155 |
| 1999 | 15.35 | 153 |
| 1998 | 17.45 | 148 |
| 1997 | 15.45 | 152 |
| 1996 | 16.07 | 149 |
| 1995 | 14.46 | 151 |
| 1994 | 11.8 | 147 |
| 1993 | 14.63 | 141 |
| 1992 | 18.82 | 132 |
| 1991 | 18.77 | 136 |
| 1990 | 17.39 | 137 |
| 1989 | 14.34 | 124 |
| 1988 | 14.83 | 122 |
| 1987 | 11.63 | 125 |
| 1986 | 10.68 | 123 |