| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 48 | 102 |
| 2015 | 65 | 97 |
| 2014 | 126 | 83 |
| 2013 | 147 | 77 |
| 2012 | 155 | 77 |
| 2011 | 135 | 77 |
| 2010 | 100 | 82 |
| 2009 | 91 | 80 |
| 2008 | 152 | 76 |
| 2007 | 102 | 78 |
| 2006 | 82 | 79 |
| 2005 | 71 | 79 |
| 2004 | 46 | 83 |
| 2003 | 28 | 92 |
| 2002 | 21 | 98 |
| 2001 | 17 | 104 |
| 2000 | 11 | 113 |
| 1999 | 7 | 121 |
| 1998 | 4 | 136 |
| 1997 | 5 | 138 |
| 1996 | 2 | 153 |
| 1995 | 1 | 162 |
| 1994 | 1 | 169 |
| 1993 | 1 | 150 |
| 1992 | 1 | 158 |
| 1991 | 1 | 144 |
| 1990 | 1 | 149 |
| 1989 | 0 | 151 |
| 1988 | 0 | 148 |
| 1987 | 0 | 147 |
| 1986 | 0 | 146 |