| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 75 | 76 |
| 2015 | 73 | 92 |
| 2014 | 80 | 96 |
| 2013 | 75 | 99 |
| 2012 | 67 | 98 |
| 2011 | 66 | 99 |
| 2010 | 55 | 100 |
| 2009 | 47 | 101 |
| 2008 | 50 | 101 |
| 2007 | 40 | 104 |
| 2006 | 33 | 103 |
| 2005 | 28 | 101 |
| 2004 | 26 | 101 |
| 2003 | 23 | 98 |
| 2002 | 24 | 88 |
| 2001 | 27 | 83 |
| 2000 | 27 | 85 |
| 1999 | 28 | 79 |
| 1998 | 29 | 78 |
| 1997 | 31 | 75 |
| 1996 | 31 | 73 |
| 1995 | 29 | 73 |
| 1994 | 25 | 62 |
| 1993 | 24 | 63 |
| 1992 | 25 | 58 |
| 1991 | 26 | 59 |