| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 25 | 154 |
| 2015 | 24.8 | 154 |
| 2014 | 24.5 | 154 |
| 2013 | 24.2 | 155 |
| 2012 | 24 | 155 |
| 2011 | 23.7 | 156 |
| 2010 | 23.5 | 156 |
| 2009 | 23.3 | 156 |
| 2008 | 23.2 | 156 |
| 2007 | 23.2 | 156 |
| 2006 | 23.2 | 156 |
| 2005 | 23.3 | 156 |
| 2004 | 23.4 | 156 |
| 2003 | 23.6 | 157 |
| 2002 | 23.9 | 158 |
| 2001 | 24.2 | 158 |
| 2000 | 24.5 | 158 |
| 1999 | 24.9 | 158 |
| 1998 | 25.3 | 158 |
| 1997 | 25.8 | 158 |
| 1996 | 26.3 | 158 |
| 1995 | 26.8 | 158 |
| 1994 | 27.3 | 157 |
| 1993 | 27.9 | 157 |
| 1992 | 28.4 | 156 |
| 1991 | 28.9 | 155 |
| 1990 | 29.4 | 155 |
| 1989 | 29.8 | 152 |
| 1988 | 30.3 | 153 |
| 1987 | 30.7 | 153 |
| 1986 | 31 | 153 |