| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 103.5 | 135 |
| 2014 | 125.4 | 132 |
| 2013 | 126.9 | 134 |
| 2012 | 112.6 | 136 |
| 2011 | 97.4 | 139 |
| 2010 | 77.4 | 142 |
| 2009 | 69.4 | 139 |
| 2008 | 80 | 137 |
| 2007 | 55.1 | 141 |
| 2006 | 37.9 | 145 |
| 2005 | 29.3 | 151 |
| 2004 | 23.2 | 154 |
| 2003 | 17.1 | 156 |
| 2002 | 13.5 | 157 |
| 2001 | 11.9 | 153 |
| 2000 | 8.8 | 159 |
| 1999 | 11 | 153 |
| 1998 | 14.4 | 149 |
| 1997 | 9.8 | 155 |
| 1996 | 10.8 | 153 |
| 1995 | 13.1 | 150 |
| 1994 | 15 | 138 |
| 1993 | 18.6 | 128 |
| 1992 | 19.6 | 127 |
| 1991 | 25.1 | 121 |
| 1990 | 28.2 | 115 |