| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 38 | 64 |
| 2015 | 34 | 74 |
| 2014 | 32 | 84 |
| 2013 | 31 | 85 |
| 2012 | 27 | 86 |
| 2011 | 23 | 96 |
| 2010 | 20 | 97 |
| 2009 | 19 | 95 |
| 2008 | 17 | 99 |
| 2007 | 13 | 104 |
| 2006 | 13 | 98 |
| 2005 | 11 | 101 |
| 2004 | 12 | 93 |
| 2003 | 11 | 94 |
| 2002 | 10 | 92 |
| 2001 | 11 | 85 |
| 2000 | 11 | 85 |
| 1999 | 11 | 86 |
| 1998 | 11 | 86 |
| 1997 | 12 | 85 |
| 1996 | 10 | 85 |
| 1995 | 10 | 85 |
| 1994 | 9 | 77 |
| 1993 | 8 | 81 |
| 1992 | 8 | 75 |
| 1991 | 8 | 81 |
| 1990 | 7 | 82 |
| 1989 | 7 | 70 |
| 1988 | 7 | 67 |
| 1987 | 7 | 65 |
| 1986 | 7 | 62 |