| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 46 | 112 |
| 2015 | 44 | 131 |
| 2014 | 55 | 131 |
| 2013 | 54 | 135 |
| 2012 | 51 | 136 |
| 2011 | 48 | 136 |
| 2010 | 42 | 133 |
| 2009 | 37 | 134 |
| 2008 | 47 | 127 |
| 2007 | 36 | 130 |
| 2006 | 25 | 135 |
| 2005 | 21 | 136 |
| 2004 | 16 | 141 |
| 2003 | 14 | 142 |
| 2002 | 11 | 141 |
| 2001 | 10 | 137 |
| 2000 | 10 | 135 |
| 1999 | 9 | 137 |
| 1998 | 10 | 133 |
| 1997 | 10 | 133 |
| 1996 | 9 | 140 |
| 1995 | 9 | 135 |
| 1994 | 10 | 125 |
| 1993 | 7 | 127 |
| 1992 | 8 | 121 |
| 1991 | 12 | 109 |
| 1990 | 10 | 108 |