| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 27.8 | 178 |
| 2015 | 27.3 | 178 |
| 2014 | 26.8 | 178 |
| 2013 | 26.3 | 178 |
| 2012 | 25.9 | 178 |
| 2011 | 25.4 | 179 |
| 2010 | 25 | 179 |
| 2009 | 24.5 | 179 |
| 2008 | 24.2 | 179 |
| 2007 | 23.8 | 179 |
| 2006 | 23.5 | 179 |
| 2005 | 23.1 | 179 |
| 2004 | 22.8 | 179 |
| 2003 | 22.5 | 179 |
| 2002 | 22.1 | 179 |
| 2001 | 21.7 | 179 |
| 2000 | 21.3 | 179 |
| 1999 | 20.9 | 179 |
| 1998 | 20.5 | 179 |
| 1997 | 20.1 | 179 |
| 1996 | 19.8 | 179 |
| 1995 | 19.4 | 179 |
| 1994 | 18.9 | 178 |
| 1993 | 18.4 | 178 |
| 1992 | 18 | 178 |
| 1991 | 17.5 | 179 |
| 1990 | 17.1 | 179 |
| 1989 | 16.7 | 177 |
| 1988 | 16.4 | 177 |
| 1987 | 16.1 | 178 |
| 1986 | 15.7 | 178 |