| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 29 | 115 |
| 2015 | 34 | 116 |
| 2014 | 49 | 113 |
| 2013 | 53 | 107 |
| 2012 | 59 | 105 |
| 2011 | 64 | 105 |
| 2010 | 49 | 107 |
| 2009 | 31 | 113 |
| 2008 | 40 | 115 |
| 2007 | 40 | 111 |
| 2006 | 32 | 112 |
| 2005 | 23 | 114 |
| 2004 | 23 | 109 |
| 2003 | 17 | 110 |
| 2002 | 14 | 110 |
| 2001 | 17 | 107 |
| 2000 | 17 | 104 |
| 1999 | 15 | 102 |
| 1998 | 15 | 99 |
| 1997 | 18 | 96 |
| 1996 | 20 | 89 |
| 1995 | 16 | 98 |
| 1994 | 14 | 94 |
| 1993 | 10 | 96 |
| 1992 | 16 | 80 |
| 1991 | 28 | 61 |
| 1990 | 51 | 52 |
| 1989 | 54 | 52 |
| 1988 | 55 | 51 |
| 1987 | 54 | 50 |
| 1986 | 63 | 46 |