| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 53418 | 9 |
| 2015 | 53015 | 10 |
| 2014 | 62426 | 8 |
| 2013 | 61191 | 10 |
| 2012 | 58508 | 10 |
| 2011 | 61754 | 11 |
| 2010 | 58041 | 9 |
| 2009 | 58163 | 9 |
| 2008 | 64322 | 9 |
| 2007 | 58487 | 12 |
| 2006 | 52027 | 12 |
| 2005 | 48800 | 11 |
| 2004 | 46512 | 10 |
| 2003 | 40459 | 9 |
| 2002 | 33229 | 9 |
| 2001 | 30752 | 11 |
| 2000 | 30744 | 12 |
| 1999 | 33441 | 10 |
| 1998 | 33368 | 8 |
| 1997 | 32836 | 8 |
| 1996 | 35651 | 8 |
| 1995 | 35351 | 6 |
| 1994 | 29996 | 7 |
| 1993 | 27598 | 8 |
| 1992 | 29570 | 8 |
| 1991 | 27011 | 10 |
| 1990 | 26891 | 9 |
| 1989 | 21901 | 13 |
| 1988 | 22527 | 10 |
| 1987 | 21341 | 10 |
| 1986 | 17201 | 10 |