| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 1794 | 86 |
| 2015 | 1759 | 106 |
| 2014 | 1725 | 108 |
| 2013 | 1687 | 112 |
| 2012 | 1640 | 113 |
| 2011 | 1592 | 112 |
| 2010 | 1532 | 125 |
| 2009 | 1477 | 111 |
| 2008 | 1417 | 111 |
| 2007 | 1348 | 112 |
| 2006 | 1300 | 108 |
| 2005 | 1278 | 105 |
| 2004 | 1240 | 104 |
| 2003 | 1182 | 103 |
| 2002 | 1146 | 103 |
| 2001 | 1114 | 99 |
| 2000 | 1078 | 97 |
| 1999 | 1067 | 91 |
| 1998 | 1051 | 92 |
| 1997 | 1045 | 92 |
| 1996 | 1085 | 89 |
| 1995 | 1132 | 85 |
| 1994 | 1130 | 81 |
| 1993 | 1160 | 77 |
| 1992 | 1216 | 73 |
| 1991 | 1188 | 75 |
| 1990 | 1314 | 69 |
| 1989 | 1397 | 58 |
| 1988 | 1291 | 56 |
| 1987 | 1455 | 55 |
| 1986 | 1588 | 53 |