| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 65.51 | 140 |
| 2015 | 66.78 | 145 |
| 2014 | 74.68 | 146 |
| 2013 | 73.35 | 148 |
| 2012 | 66.05 | 148 |
| 2011 | 61.98 | 150 |
| 2010 | 47.94 | 155 |
| 2009 | 46.9 | 153 |
| 2008 | 51.4 | 151 |
| 2007 | 38.03 | 159 |
| 2006 | 28.34 | 163 |
| 2005 | 24.6 | 160 |
| 2004 | 22.12 | 159 |
| 2003 | 19.19 | 158 |
| 2002 | 16.06 | 158 |
| 2001 | 15.25 | 154 |
| 2000 | 13.7 | 156 |
| 1999 | 12.49 | 156 |
| 1998 | 16.46 | 151 |
| 1997 | 17.68 | 148 |
| 1996 | 18.28 | 147 |
| 1995 | 16.61 | 148 |
| 1994 | 16.81 | 136 |
| 1993 | 20.28 | 130 |
| 1992 | 23.17 | 125 |
| 1991 | 25.71 | 126 |
| 1990 | 26.74 | 121 |