| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 19.9 | 161 |
| 2015 | 19.5 | 161 |
| 2014 | 19.2 | 162 |
| 2013 | 18.9 | 162 |
| 2012 | 18.5 | 163 |
| 2011 | 18.2 | 165 |
| 2010 | 17.8 | 164 |
| 2009 | 17.5 | 165 |
| 2008 | 17.1 | 165 |
| 2007 | 16.8 | 165 |
| 2006 | 16.4 | 165 |
| 2005 | 16.1 | 165 |
| 2004 | 15.8 | 165 |
| 2003 | 15.4 | 165 |
| 2002 | 15.1 | 165 |
| 2001 | 14.8 | 165 |
| 2000 | 14.5 | 165 |
| 1999 | 14.3 | 165 |
| 1998 | 14.1 | 165 |
| 1997 | 13.9 | 165 |
| 1996 | 13.7 | 165 |
| 1995 | 13.4 | 165 |
| 1994 | 13.2 | 166 |
| 1993 | 12.9 | 166 |
| 1992 | 12.5 | 166 |
| 1991 | 12.2 | 166 |
| 1990 | 11.9 | 166 |
| 1989 | 11.7 | 164 |
| 1988 | 11.4 | 164 |
| 1987 | 11.2 | 165 |
| 1986 | 11 | 165 |