| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 27 | 179 |
| 2015 | 26.5 | 179 |
| 2014 | 25.9 | 179 |
| 2013 | 25.3 | 179 |
| 2012 | 24.7 | 179 |
| 2011 | 24.2 | 180 |
| 2010 | 23.6 | 180 |
| 2009 | 23.1 | 180 |
| 2008 | 22.5 | 180 |
| 2007 | 22 | 180 |
| 2006 | 21.5 | 180 |
| 2005 | 20.9 | 180 |
| 2004 | 20.4 | 180 |
| 2003 | 19.9 | 180 |
| 2002 | 19.4 | 180 |
| 2001 | 18.9 | 180 |
| 2000 | 18.5 | 180 |
| 1999 | 18.1 | 180 |
| 1998 | 17.8 | 180 |
| 1997 | 17.5 | 180 |
| 1996 | 17.2 | 180 |
| 1995 | 16.8 | 181 |
| 1994 | 16.4 | 180 |
| 1993 | 16 | 180 |
| 1992 | 15.5 | 180 |
| 1991 | 15.1 | 181 |
| 1990 | 14.7 | 181 |
| 1989 | 14.3 | 180 |
| 1988 | 13.9 | 180 |
| 1987 | 13.6 | 181 |
| 1986 | 13.3 | 181 |