| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 47 | 58 |
| 2015 | 55 | 58 |
| 2014 | 71 | 52 |
| 2013 | 65 | 56 |
| 2012 | 68 | 53 |
| 2011 | 62 | 57 |
| 2010 | 55 | 56 |
| 2009 | 43 | 63 |
| 2008 | 57 | 53 |
| 2007 | 47 | 58 |
| 2006 | 41 | 56 |
| 2005 | 36 | 58 |
| 2004 | 10 | 100 |
| 2003 | 9 | 102 |
| 2002 | 8 | 102 |
| 2001 | 7 | 102 |
| 2000 | 6 | 111 |
| 1999 | 6 | 111 |
| 1998 | 7 | 106 |
| 1997 | 6 | 113 |
| 1996 | 6 | 106 |
| 1995 | 5 | 108 |
| 1994 | 4 | 97 |
| 1993 | 5 | 99 |
| 1992 | 6 | 83 |
| 1991 | 7 | 85 |
| 1990 | 5 | 95 |
| 1989 | 4 | 83 |
| 1988 | 5 | 78 |
| 1987 | 4 | 82 |
| 1986 | 3 | 77 |