| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 46.35 | 144 |
| 2015 | 48.44 | 151 |
| 2014 | 53.91 | 153 |
| 2013 | 57.24 | 152 |
| 2012 | 52.26 | 154 |
| 2011 | 51.8 | 155 |
| 2010 | 43.44 | 160 |
| 2009 | 36.71 | 161 |
| 2008 | 39.78 | 161 |
| 2007 | 33.57 | 164 |
| 2006 | 30.41 | 161 |
| 2005 | 21.84 | 164 |
| 2004 | 18.33 | 165 |
| 2003 | 15.63 | 163 |
| 2002 | 13.24 | 162 |
| 2001 | 12.96 | 159 |
| 2000 | 12.94 | 158 |
| 1999 | 14.06 | 155 |
| 1998 | 13.75 | 156 |
| 1997 | 14.02 | 155 |
| 1996 | 14.43 | 153 |
| 1995 | 14.15 | 152 |
| 1994 | 13.16 | 143 |
| 1993 | 12.5 | 145 |
| 1992 | 14.64 | 141 |
| 1991 | 14.44 | 142 |
| 1990 | 10.2 | 147 |
| 1989 | 9.82 | 132 |
| 1988 | 9.57 | 134 |
| 1987 | 9.1 | 132 |
| 1986 | 8.03 | 128 |