| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 20.5 | 170 |
| 2015 | 20.2 | 170 |
| 2014 | 19.9 | 170 |
| 2013 | 19.7 | 170 |
| 2012 | 19.5 | 169 |
| 2011 | 19.2 | 170 |
| 2010 | 19 | 170 |
| 2009 | 18.7 | 171 |
| 2008 | 18.4 | 171 |
| 2007 | 18.1 | 171 |
| 2006 | 17.8 | 171 |
| 2005 | 17.6 | 170 |
| 2004 | 17.3 | 169 |
| 2003 | 16.9 | 170 |
| 2002 | 16.5 | 170 |
| 2001 | 16.1 | 170 |
| 2000 | 15.7 | 170 |
| 1999 | 15.1 | 171 |
| 1998 | 14.6 | 171 |
| 1997 | 14.1 | 173 |
| 1996 | 13.6 | 173 |
| 1995 | 13.2 | 173 |
| 1994 | 12.7 | 172 |
| 1993 | 12.2 | 172 |
| 1992 | 11.8 | 172 |
| 1991 | 11.4 | 173 |
| 1990 | 11 | 173 |