| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 80.23 | 135 |
| 2015 | 87.25 | 138 |
| 2014 | 87.76 | 141 |
| 2013 | 84.53 | 144 |
| 2012 | 78.9 | 143 |
| 2011 | 75.17 | 145 |
| 2010 | 66.23 | 145 |
| 2009 | 65.85 | 142 |
| 2008 | 65.49 | 142 |
| 2007 | 58.85 | 143 |
| 2006 | 47.56 | 144 |
| 2005 | 43.1 | 144 |
| 2004 | 35.38 | 147 |
| 2003 | 29.6 | 146 |
| 2002 | 34.72 | 134 |
| 2001 | 35.96 | 130 |
| 2000 | 39.54 | 124 |
| 1999 | 41.54 | 122 |
| 1998 | 37.24 | 127 |
| 1997 | 33.39 | 131 |
| 1996 | 29.08 | 133 |
| 1995 | 28.13 | 130 |
| 1994 | 21.68 | 127 |
| 1993 | 18.78 | 134 |
| 1992 | 22.57 | 127 |
| 1991 | 34.74 | 109 |