| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 45 | 50 |
| 2015 | 44 | 71 |
| 2014 | 56 | 68 |
| 2013 | 43 | 75 |
| 2012 | 41 | 73 |
| 2011 | 36 | 75 |
| 2010 | 34 | 72 |
| 2009 | 50 | 63 |
| 2008 | 59 | 60 |
| 2007 | 52 | 59 |
| 2006 | 41 | 60 |
| 2005 | 34 | 60 |
| 2004 | 32 | 55 |
| 2003 | 24 | 57 |
| 2002 | 17 | 60 |
| 2001 | 19 | 55 |
| 2000 | 17 | 56 |
| 1999 | 15 | 59 |
| 1998 | 26 | 46 |
| 1997 | 12 | 62 |
| 1996 | 12 | 59 |
| 1995 | 13 | 55 |
| 1994 | 12 | 49 |
| 1993 | 12 | 47 |
| 1992 | 12 | 45 |
| 1991 | 5 | 70 |
| 1990 | 6 | 60 |
| 1989 | 8 | 49 |
| 1988 | 7 | 49 |
| 1987 | 7 | 48 |
| 1986 | 6 | 50 |