| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 52 | 103 |
| 2015 | 49 | 124 |
| 2014 | 53 | 127 |
| 2013 | 49 | 130 |
| 2012 | 46 | 130 |
| 2011 | 39 | 132 |
| 2010 | 36 | 130 |
| 2009 | 35 | 127 |
| 2008 | 39 | 124 |
| 2007 | 30 | 131 |
| 2006 | 20 | 133 |
| 2005 | 15 | 138 |
| 2004 | 11 | 143 |
| 2003 | 9 | 143 |
| 2002 | 8 | 140 |
| 2001 | 7 | 141 |
| 2000 | 6 | 141 |
| 1999 | 6 | 136 |
| 1998 | 6 | 138 |
| 1997 | 5 | 142 |
| 1996 | 5 | 142 |
| 1995 | 4 | 147 |
| 1994 | 2 | 137 |
| 1993 | 2 | 133 |
| 1992 | 3 | 121 |
| 1991 | 5 | 114 |
| 1990 | 6 | 110 |