| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 34 | 129 |
| 2015 | 38 | 131 |
| 2014 | 52 | 129 |
| 2013 | 64 | 116 |
| 2012 | 67 | 115 |
| 2011 | 66 | 112 |
| 2010 | 33 | 134 |
| 2009 | 21 | 143 |
| 2008 | 36 | 130 |
| 2007 | 21 | 141 |
| 2006 | 15 | 148 |
| 2005 | 12 | 147 |
| 2004 | 10 | 147 |
| 2003 | 8 | 148 |
| 2002 | 7 | 147 |
| 2001 | 6 | 148 |
| 2000 | 6 | 145 |
| 1999 | 5 | 153 |
| 1998 | 5 | 153 |
| 1997 | 5 | 156 |
| 1996 | 5 | 157 |
| 1995 | 4 | 156 |
| 1994 | 3 | 160 |
| 1993 | 4 | 138 |
| 1992 | 4 | 135 |
| 1991 | 4 | 131 |
| 1990 | 9 | 103 |
| 1989 | 10 | 98 |
| 1988 | 11 | 91 |
| 1987 | 11 | 90 |
| 1986 | 11 | 80 |