| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 56 | 99 |
| 2015 | 54 | 121 |
| 2014 | 61 | 119 |
| 2013 | 59 | 119 |
| 2012 | 55 | 122 |
| 2011 | 58 | 119 |
| 2010 | 52 | 119 |
| 2009 | 54 | 116 |
| 2008 | 55 | 115 |
| 2007 | 47 | 118 |
| 2006 | 39 | 119 |
| 2005 | 35 | 114 |
| 2004 | 31 | 113 |
| 2003 | 26 | 115 |
| 2002 | 21 | 117 |
| 2001 | 20 | 117 |
| 2000 | 20 | 115 |
| 1999 | 17 | 117 |
| 1998 | 16 | 118 |
| 1997 | 17 | 118 |
| 1996 | 21 | 103 |
| 1995 | 21 | 98 |
| 1994 | 16 | 92 |
| 1993 | 12 | 98 |
| 1992 | 9 | 104 |
| 1991 | 20 | 82 |
| 1990 | 19 | 79 |