| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 25.7 | 164 |
| 2015 | 25.1 | 164 |
| 2014 | 24.5 | 165 |
| 2013 | 23.8 | 165 |
| 2012 | 23.2 | 165 |
| 2011 | 22.6 | 166 |
| 2010 | 22 | 166 |
| 2009 | 21.4 | 166 |
| 2008 | 20.8 | 166 |
| 2007 | 20.2 | 166 |
| 2006 | 19.5 | 166 |
| 2005 | 18.9 | 166 |
| 2004 | 18.3 | 166 |
| 2003 | 17.6 | 167 |
| 2002 | 17 | 168 |
| 2001 | 16.3 | 169 |
| 2000 | 15.7 | 169 |
| 1999 | 15.2 | 170 |
| 1998 | 14.8 | 170 |
| 1997 | 14.3 | 171 |
| 1996 | 13.9 | 172 |
| 1995 | 13.4 | 172 |
| 1994 | 13 | 170 |
| 1993 | 12.5 | 170 |
| 1992 | 12.1 | 170 |
| 1991 | 11.7 | 171 |
| 1990 | 11.4 | 171 |