| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 1888 | 84 |
| 2015 | 1865 | 104 |
| 2014 | 1847 | 105 |
| 2013 | 1809 | 109 |
| 2012 | 1779 | 110 |
| 2011 | 1733 | 109 |
| 2010 | 1665 | 122 |
| 2009 | 1621 | 108 |
| 2008 | 1578 | 107 |
| 2007 | 1485 | 109 |
| 2006 | 1436 | 105 |
| 2005 | 1365 | 102 |
| 2004 | 1336 | 101 |
| 2003 | 1295 | 100 |
| 2002 | 1236 | 100 |
| 2001 | 1208 | 97 |
| 2000 | 1209 | 92 |
| 1999 | 1201 | 87 |
| 1998 | 1196 | 87 |
| 1997 | 1145 | 86 |
| 1996 | 1211 | 85 |
| 1995 | 1082 | 86 |
| 1994 | 1144 | 80 |
| 1993 | 1031 | 79 |
| 1992 | 1065 | 77 |
| 1991 | 1087 | 78 |
| 1990 | 969 | 79 |
| 1989 | 959 | 66 |
| 1988 | 931 | 65 |
| 1987 | 869 | 66 |
| 1986 | 869 | 66 |