| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 43 | 115 |
| 2015 | 42 | 135 |
| 2014 | 52 | 134 |
| 2013 | 78 | 116 |
| 2012 | 68 | 124 |
| 2011 | 56 | 131 |
| 2010 | 38 | 137 |
| 2009 | 38 | 131 |
| 2008 | 40 | 135 |
| 2007 | 34 | 132 |
| 2006 | 29 | 129 |
| 2005 | 26 | 128 |
| 2004 | 25 | 123 |
| 2003 | 24 | 121 |
| 2002 | 24 | 109 |
| 2001 | 22 | 110 |
| 2000 | 21 | 109 |
| 1999 | 22 | 106 |
| 1998 | 23 | 108 |
| 1997 | 30 | 99 |
| 1996 | 31 | 94 |
| 1995 | 26 | 93 |
| 1994 | 20 | 98 |
| 1993 | 21 | 92 |
| 1992 | 20 | 93 |
| 1991 | 15 | 105 |
| 1990 | 13 | 105 |
| 1989 | 11 | 94 |