| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 13 | 140 |
| 2015 | 13 | 140 |
| 2014 | 12 | 149 |
| 2013 | 11 | 150 |
| 2012 | 10 | 152 |
| 2011 | 9 | 155 |
| 2010 | 9 | 150 |
| 2009 | 10 | 146 |
| 2008 | 20 | 128 |
| 2007 | 25 | 118 |
| 2006 | 26 | 117 |
| 2005 | 25 | 109 |
| 2004 | 28 | 101 |
| 2003 | 26 | 96 |
| 2002 | 24 | 92 |
| 2001 | 23 | 94 |
| 2000 | 25 | 89 |
| 1999 | 22 | 90 |
| 1998 | 21 | 85 |
| 1997 | 21 | 91 |
| 1996 | 20 | 91 |
| 1995 | 20 | 86 |
| 1994 | 19 | 86 |
| 1993 | 18 | 76 |
| 1992 | 18 | 76 |
| 1991 | 17 | 73 |
| 1990 | 17 | 76 |
| 1989 | 16 | 72 |
| 1988 | 15 | 69 |
| 1987 | 14 | 71 |
| 1986 | 10 | 77 |