| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 22.2 | 163 |
| 2014 | 25.51 | 165 |
| 2013 | 24.83 | 171 |
| 2012 | 24.09 | 169 |
| 2011 | 25.15 | 171 |
| 2010 | 23.07 | 170 |
| 2009 | 23.25 | 168 |
| 2008 | 23.11 | 169 |
| 2007 | 20.49 | 170 |
| 2006 | 18.19 | 171 |
| 2005 | 16.56 | 169 |
| 2004 | 16.22 | 167 |
| 2003 | 14.08 | 166 |
| 2002 | 11.69 | 167 |
| 2001 | 10.86 | 163 |
| 2000 | 10.68 | 161 |
| 1999 | 11.32 | 159 |
| 1998 | 11.5 | 160 |
| 1997 | 10.72 | 159 |
| 1996 | 11.98 | 158 |
| 1995 | 12.09 | 158 |
| 1994 | 10.06 | 149 |
| 1993 | 9.27 | 151 |
| 1992 | 10.38 | 149 |
| 1991 | 10.16 | 150 |
| 1990 | 10.19 | 148 |
| 1989 | 9.3 | 134 |
| 1988 | 8.99 | 135 |
| 1987 | 7.87 | 133 |
| 1986 | 6.03 | 130 |