| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 21.9 | 158 |
| 2015 | 22.2 | 158 |
| 2014 | 22.5 | 156 |
| 2013 | 22.7 | 156 |
| 2012 | 22.8 | 156 |
| 2011 | 22.9 | 157 |
| 2010 | 23 | 157 |
| 2009 | 22.9 | 158 |
| 2008 | 22.8 | 158 |
| 2007 | 22.7 | 158 |
| 2006 | 22.6 | 158 |
| 2005 | 22.5 | 158 |
| 2004 | 22.3 | 159 |
| 2003 | 22.1 | 159 |
| 2002 | 21.9 | 159 |
| 2001 | 21.6 | 159 |
| 2000 | 21.4 | 159 |
| 1999 | 21.7 | 159 |
| 1998 | 22.1 | 159 |
| 1997 | 22.5 | 159 |
| 1996 | 22.8 | 159 |
| 1995 | 23.1 | 159 |
| 1994 | 23.4 | 159 |
| 1993 | 23.8 | 159 |
| 1992 | 24.1 | 159 |
| 1991 | 24.6 | 159 |
| 1990 | 25 | 159 |
| 1989 | 28.3 | 154 |
| 1988 | 33.3 | 151 |
| 1987 | 39 | 148 |
| 1986 | 45.6 | 144 |