| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 12.1 | 176 |
| 2015 | 11.9 | 176 |
| 2014 | 11.6 | 176 |
| 2013 | 11.4 | 176 |
| 2012 | 11.2 | 176 |
| 2011 | 10.9 | 177 |
| 2010 | 10.8 | 177 |
| 2009 | 10.5 | 177 |
| 2008 | 10.4 | 177 |
| 2007 | 10.2 | 177 |
| 2006 | 10 | 177 |
| 2005 | 9.9 | 177 |
| 2004 | 9.7 | 177 |
| 2003 | 9.6 | 177 |
| 2002 | 9.4 | 177 |
| 2001 | 9.2 | 177 |
| 2000 | 9 | 176 |
| 1999 | 8.8 | 175 |
| 1998 | 8.7 | 175 |
| 1997 | 8.5 | 175 |
| 1996 | 8.3 | 175 |
| 1995 | 8.2 | 175 |
| 1994 | 8 | 174 |
| 1993 | 7.7 | 174 |
| 1992 | 7.4 | 174 |
| 1991 | 7.2 | 175 |
| 1990 | 6.9 | 175 |