| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 44 | 51 |
| 2015 | 45 | 69 |
| 2014 | 48 | 71 |
| 2013 | 49 | 70 |
| 2012 | 42 | 72 |
| 2011 | 42 | 70 |
| 2010 | 27 | 81 |
| 2009 | 21 | 84 |
| 2008 | 26 | 81 |
| 2007 | 21 | 84 |
| 2006 | 16 | 86 |
| 2005 | 17 | 78 |
| 2004 | 14 | 76 |
| 2003 | 12 | 73 |
| 2002 | 12 | 73 |
| 2001 | 10 | 70 |
| 2000 | 11 | 69 |
| 1999 | 11 | 69 |
| 1998 | 12 | 64 |
| 1997 | 12 | 59 |
| 1996 | 10 | 68 |
| 1995 | 11 | 62 |
| 1994 | 10 | 58 |
| 1993 | 9 | 55 |
| 1992 | 9 | 53 |
| 1991 | 8 | 52 |
| 1990 | 7 | 56 |
| 1989 | 6 | 58 |
| 1988 | 5 | 58 |
| 1987 | 7 | 47 |
| 1986 | 8 | 46 |