| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 36 | 93 |
| 2015 | 36 | 108 |
| 2014 | 39 | 108 |
| 2013 | 38 | 110 |
| 2012 | 38 | 110 |
| 2011 | 33 | 112 |
| 2010 | 24 | 120 |
| 2009 | 14 | 134 |
| 2008 | 17 | 129 |
| 2007 | 16 | 128 |
| 2006 | 13 | 130 |
| 2005 | 8 | 134 |
| 2004 | 6 | 138 |
| 2003 | 4 | 143 |
| 2002 | 3 | 144 |
| 2001 | 3 | 144 |
| 2000 | 3 | 144 |
| 1999 | 2 | 144 |
| 1998 | 3 | 144 |
| 1997 | 3 | 137 |
| 1996 | 3 | 136 |
| 1995 | 5 | 123 |
| 1994 | 3 | 118 |
| 1993 | 2 | 124 |
| 1992 | 5 | 103 |
| 1991 | 8 | 92 |
| 1990 | 11 | 84 |
| 1989 | 14 | 64 |
| 1988 | 9 | 74 |
| 1987 | 9 | 74 |
| 1986 | 8 | 67 |