| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 91 | 140 |
| 2014 | 112.2 | 135 |
| 2013 | 109.7 | 138 |
| 2012 | 99.7 | 140 |
| 2011 | 78.8 | 146 |
| 2010 | 62.4 | 147 |
| 2009 | 58.1 | 146 |
| 2008 | 71.4 | 139 |
| 2007 | 49.9 | 143 |
| 2006 | 38.9 | 144 |
| 2005 | 29.1 | 152 |
| 2004 | 24 | 152 |
| 2003 | 20.5 | 151 |
| 2002 | 16.7 | 150 |
| 2001 | 15.3 | 147 |
| 2000 | 14.5 | 149 |
| 1999 | 14.3 | 148 |
| 1998 | 20 | 139 |
| 1997 | 19.1 | 145 |
| 1996 | 23 | 138 |
| 1995 | 18.8 | 142 |
| 1994 | 17.9 | 131 |
| 1993 | 21.8 | 126 |
| 1992 | 25.9 | 117 |
| 1991 | 26 | 120 |
| 1990 | 32.2 | 106 |