| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 36 | 66 |
| 2015 | 34 | 75 |
| 2014 | 40 | 75 |
| 2013 | 38 | 78 |
| 2012 | 35 | 79 |
| 2011 | 33 | 80 |
| 2010 | 29 | 79 |
| 2009 | 27 | 80 |
| 2008 | 31 | 76 |
| 2007 | 20 | 91 |
| 2006 | 20 | 83 |
| 2005 | 19 | 81 |
| 2004 | 15 | 85 |
| 2003 | 14 | 82 |
| 2002 | 11 | 87 |
| 2001 | 10 | 91 |
| 2000 | 8 | 95 |
| 1999 | 9 | 90 |
| 1998 | 10 | 89 |
| 1997 | 8 | 96 |
| 1996 | 9 | 91 |
| 1995 | 8 | 93 |
| 1994 | 6 | 89 |
| 1993 | 7 | 86 |
| 1992 | 6 | 84 |
| 1991 | 9 | 74 |
| 1990 | 9 | 74 |
| 1989 | 7 | 69 |
| 1988 | 7 | 65 |
| 1987 | 7 | 68 |
| 1986 | 6 | 67 |