| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 15.6 | 167 |
| 2015 | 16.1 | 165 |
| 2014 | 16.6 | 165 |
| 2013 | 17.1 | 165 |
| 2012 | 17.7 | 165 |
| 2011 | 18.2 | 163 |
| 2010 | 18.8 | 163 |
| 2009 | 19.5 | 160 |
| 2008 | 20.1 | 160 |
| 2007 | 20.8 | 160 |
| 2006 | 21.5 | 160 |
| 2005 | 22.2 | 159 |
| 2004 | 23 | 158 |
| 2003 | 23.9 | 156 |
| 2002 | 24.7 | 156 |
| 2001 | 25.6 | 156 |
| 2000 | 26.5 | 156 |
| 1999 | 27.3 | 156 |
| 1998 | 28.1 | 156 |
| 1997 | 29 | 155 |
| 1996 | 29.8 | 155 |
| 1995 | 30.5 | 155 |
| 1994 | 31.2 | 153 |
| 1993 | 32 | 153 |
| 1992 | 32.7 | 152 |
| 1991 | 33.5 | 152 |
| 1990 | 34.3 | 152 |
| 1989 | 35.1 | 150 |
| 1988 | 36 | 149 |
| 1987 | 36.8 | 150 |
| 1986 | 37.7 | 150 |