| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 18.2 | 164 |
| 2015 | 18.4 | 164 |
| 2014 | 18.5 | 164 |
| 2013 | 18.7 | 163 |
| 2012 | 18.8 | 161 |
| 2011 | 19 | 162 |
| 2010 | 19.2 | 161 |
| 2009 | 19.4 | 161 |
| 2008 | 19.6 | 161 |
| 2007 | 19.8 | 161 |
| 2006 | 19.9 | 161 |
| 2005 | 20.1 | 161 |
| 2004 | 20.2 | 161 |
| 2003 | 20.2 | 161 |
| 2002 | 20.3 | 161 |
| 2001 | 20.3 | 161 |
| 2000 | 20.3 | 161 |
| 1999 | 20.2 | 161 |
| 1998 | 20.2 | 160 |
| 1997 | 20.1 | 160 |
| 1996 | 20.1 | 160 |
| 1995 | 19.9 | 160 |
| 1994 | 19.8 | 160 |
| 1993 | 19.6 | 160 |
| 1992 | 19.4 | 160 |
| 1991 | 19.2 | 160 |
| 1990 | 19.1 | 160 |
| 1989 | 19.6 | 158 |
| 1988 | 20.1 | 158 |
| 1987 | 20.7 | 158 |
| 1986 | 21.2 | 159 |