| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 46.32 | 145 |
| 2015 | 43.91 | 153 |
| 2014 | 44.7 | 159 |
| 2013 | 41.9 | 162 |
| 2012 | 39.72 | 161 |
| 2011 | 37.75 | 163 |
| 2010 | 31.41 | 165 |
| 2009 | 28.71 | 165 |
| 2008 | 35.23 | 163 |
| 2007 | 34.05 | 163 |
| 2006 | 31.03 | 160 |
| 2005 | 30.07 | 153 |
| 2004 | 27.28 | 155 |
| 2003 | 23.16 | 152 |
| 2002 | 18.43 | 152 |
| 2001 | 16.6 | 151 |
| 2000 | 16.84 | 152 |
| 1999 | 19.42 | 145 |
| 1998 | 16.57 | 150 |
| 1997 | 20.94 | 144 |
| 1996 | 21.29 | 144 |
| 1995 | 19.7 | 142 |
| 1994 | 18.25 | 134 |
| 1993 | 16.35 | 139 |
| 1992 | 15.32 | 140 |
| 1991 | 13.84 | 143 |
| 1990 | 13.37 | 143 |
| 1989 | 11.83 | 128 |
| 1988 | 11.1 | 130 |
| 1987 | 11.78 | 124 |
| 1986 | 12.9 | 117 |