| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 124 | 85 |
| 2015 | 126 | 98 |
| 2014 | 141 | 95 |
| 2013 | 132 | 97 |
| 2012 | 114 | 97 |
| 2011 | 110 | 98 |
| 2010 | 86 | 102 |
| 2009 | 71 | 102 |
| 2008 | 79 | 102 |
| 2007 | 60 | 107 |
| 2006 | 47 | 108 |
| 2005 | 37 | 112 |
| 2004 | 33 | 111 |
| 2003 | 27 | 111 |
| 2002 | 26 | 106 |
| 2001 | 34 | 97 |
| 2000 | 37 | 93 |
| 1999 | 37 | 91 |
| 1998 | 40 | 88 |
| 1997 | 44 | 83 |
| 1996 | 42 | 82 |
| 1995 | 38 | 83 |
| 1994 | 33 | 71 |
| 1993 | 32 | 70 |
| 1992 | 32 | 68 |
| 1991 | 29 | 69 |