| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 35 | 94 |
| 2015 | 35 | 110 |
| 2014 | 36 | 111 |
| 2013 | 35 | 114 |
| 2012 | 33 | 113 |
| 2011 | 30 | 118 |
| 2010 | 25 | 118 |
| 2009 | 20 | 119 |
| 2008 | 13 | 135 |
| 2007 | 17 | 125 |
| 2006 | 17 | 122 |
| 2005 | 15 | 116 |
| 2004 | 14 | 116 |
| 1999 | 13 | 101 |
| 1998 | 13 | 100 |
| 1997 | 19 | 91 |
| 1996 | 20 | 89 |
| 1995 | 18 | 89 |
| 1994 | 20 | 70 |
| 1993 | 20 | 66 |
| 1992 | 25 | 60 |
| 1991 | 29 | 55 |
| 1990 | 26 | 58 |
| 1989 | 26 | 48 |
| 1988 | 23 | 48 |
| 1987 | 20 | 51 |
| 1986 | 18 | 50 |