| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 17 | 90 |
| 2015 | 18 | 100 |
| 2014 | 21 | 99 |
| 2013 | 21 | 102 |
| 2012 | 19 | 102 |
| 2011 | 21 | 100 |
| 2010 | 16 | 103 |
| 2009 | 15 | 102 |
| 2008 | 19 | 96 |
| 2007 | 17 | 97 |
| 2006 | 12 | 102 |
| 2005 | 9 | 107 |
| 2004 | 8 | 110 |
| 2003 | 6 | 117 |
| 2002 | 6 | 115 |
| 2001 | 5 | 113 |
| 2000 | 4 | 119 |
| 1999 | 5 | 113 |
| 1998 | 6 | 113 |
| 1997 | 5 | 118 |
| 1996 | 6 | 109 |
| 1995 | 6 | 104 |
| 1994 | 6 | 92 |
| 1993 | 6 | 92 |
| 1992 | 4 | 101 |
| 1991 | 5 | 98 |
| 1990 | 4 | 98 |