| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 142 | 62 |
| 2015 | 105 | 82 |
| 2014 | 75 | 98 |
| 2013 | 52 | 104 |
| 2012 | 41 | 108 |
| 2011 | 31 | 115 |
| 2010 | 28 | 115 |
| 2009 | 31 | 107 |
| 2008 | 28 | 113 |
| 2007 | 23 | 118 |
| 2006 | 18 | 119 |
| 2005 | 15 | 120 |
| 2004 | 13 | 123 |
| 2003 | 11 | 118 |
| 2002 | 10 | 116 |
| 2001 | 10 | 116 |
| 2000 | 9 | 117 |
| 1999 | 9 | 116 |
| 1998 | 9 | 116 |
| 1997 | 10 | 109 |
| 1996 | 8 | 114 |
| 1995 | 7 | 116 |
| 1994 | 6 | 101 |
| 1993 | 7 | 97 |
| 1992 | 6 | 96 |
| 1991 | 10 | 85 |
| 1990 | 11 | 82 |
| 1989 | 12 | 68 |
| 1988 | 11 | 68 |
| 1987 | 12 | 64 |
| 1986 | 10 | 64 |