| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 102831 | 1 |
| 2015 | 101910 | 1 |
| 2014 | 119173 | 2 |
| 2013 | 113752 | 2 |
| 2012 | 106749 | 2 |
| 2011 | 115762 | 3 |
| 2010 | 104965 | 3 |
| 2009 | 103199 | 3 |
| 2008 | 114294 | 3 |
| 2007 | 106018 | 3 |
| 2006 | 89740 | 3 |
| 2005 | 80290 | 3 |
| 2004 | 75716 | 3 |
| 2003 | 65446 | 4 |
| 2002 | 52931 | 4 |
| 2001 | 48179 | 4 |
| 2000 | 48736 | 4 |
| 1999 | 51654 | 4 |
| 1998 | 47584 | 4 |
| 1997 | 47042 | 4 |
| 1996 | 52572 | 3 |
| 1995 | 52831 | 3 |
| 1994 | 45482 | 3 |
| 1993 | 41479 | 3 |
| 1992 | 40966 | 3 |
| 1991 | 37007 | 4 |
| 1990 | 34645 | 4 |
| 1989 | 27556 | 4 |
| 1988 | 26108 | 4 |
| 1987 | 23235 | 5 |
| 1986 | 18790 | 8 |