| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 62.99 | 141 |
| 2015 | 66.99 | 144 |
| 2014 | 66.24 | 149 |
| 2013 | 62.32 | 151 |
| 2012 | 56.67 | 151 |
| 2011 | 50.67 | 156 |
| 2010 | 47.36 | 156 |
| 2009 | 46.1 | 154 |
| 2008 | 45.16 | 157 |
| 2007 | 41.34 | 156 |
| 2006 | 29.32 | 162 |
| 2005 | 29.37 | 156 |
| 2004 | 36.66 | 145 |
| 2003 | 34.46 | 142 |
| 2002 | 29.5 | 144 |
| 2001 | 28.33 | 137 |
| 2000 | 29.95 | 137 |
| 1999 | 34.61 | 130 |
| 1998 | 35.88 | 129 |
| 1997 | 37.84 | 122 |
| 1996 | 38.69 | 121 |
| 1995 | 36.94 | 121 |
| 1994 | 33.83 | 114 |
| 1993 | 32.79 | 111 |
| 1992 | 32.85 | 111 |
| 1991 | 30.15 | 118 |
| 1990 | 26.67 | 122 |
| 1989 | 24.32 | 109 |
| 1988 | 23.84 | 109 |
| 1987 | 20.42 | 111 |
| 1986 | 19.23 | 103 |