| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 27.5 | 163 |
| 2015 | 26.7 | 163 |
| 2014 | 25.9 | 163 |
| 2013 | 25.2 | 163 |
| 2012 | 24.4 | 164 |
| 2011 | 23.7 | 165 |
| 2010 | 23 | 165 |
| 2009 | 22.3 | 165 |
| 2008 | 21.6 | 165 |
| 2007 | 20.9 | 165 |
| 2006 | 20.2 | 165 |
| 2005 | 19.6 | 165 |
| 2004 | 18.9 | 165 |
| 2003 | 18.3 | 165 |
| 2002 | 17.7 | 165 |
| 2001 | 17.2 | 165 |
| 2000 | 16.6 | 165 |
| 1999 | 16.1 | 166 |
| 1998 | 15.5 | 167 |
| 1997 | 15 | 168 |
| 1996 | 14.5 | 168 |
| 1995 | 14.1 | 170 |
| 1994 | 13.6 | 169 |
| 1993 | 13.2 | 169 |
| 1992 | 12.7 | 169 |
| 1991 | 12.3 | 170 |
| 1990 | 12 | 170 |