| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 20 | 180 |
| 2015 | 19.6 | 180 |
| 2014 | 19.1 | 181 |
| 2013 | 18.7 | 181 |
| 2012 | 18.3 | 181 |
| 2011 | 17.9 | 182 |
| 2010 | 17.5 | 182 |
| 2009 | 17.1 | 183 |
| 2008 | 16.7 | 183 |
| 2007 | 16.3 | 183 |
| 2006 | 15.9 | 183 |
| 2005 | 15.6 | 184 |
| 2004 | 15.2 | 185 |
| 2003 | 14.8 | 185 |
| 2002 | 14.5 | 185 |
| 2001 | 14.2 | 185 |
| 2000 | 13.9 | 185 |
| 1999 | 13.6 | 186 |
| 1998 | 13.3 | 186 |
| 1997 | 13.1 | 186 |
| 1996 | 12.9 | 186 |
| 1995 | 12.6 | 186 |
| 1994 | 12.4 | 185 |
| 1993 | 12.1 | 185 |
| 1992 | 11.9 | 185 |
| 1991 | 11.6 | 186 |
| 1990 | 11.4 | 186 |
| 1989 | 11.2 | 184 |
| 1988 | 10.9 | 184 |
| 1987 | 10.7 | 184 |
| 1986 | 10.5 | 185 |