| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 27 | 99 |
| 2015 | 23 | 122 |
| 2014 | 26 | 123 |
| 2013 | 24 | 129 |
| 2012 | 21 | 133 |
| 2011 | 23 | 129 |
| 2010 | 20 | 127 |
| 2009 | 18 | 123 |
| 2008 | 19 | 125 |
| 2007 | 17 | 126 |
| 2006 | 15 | 125 |
| 2005 | 13 | 128 |
| 2004 | 12 | 129 |
| 2003 | 11 | 119 |
| 2002 | 8 | 126 |
| 2001 | 8 | 124 |
| 2000 | 8 | 122 |
| 1999 | 10 | 112 |
| 1998 | 10 | 110 |
| 1997 | 11 | 105 |
| 1996 | 11 | 104 |
| 1995 | 11 | 100 |
| 1994 | 9 | 91 |
| 1993 | 8 | 92 |
| 1992 | 8 | 93 |
| 1991 | 14 | 77 |
| 1990 | 18 | 69 |