| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 6.7 | 179 |
| 2015 | 6.5 | 179 |
| 2014 | 6.3 | 179 |
| 2013 | 6.1 | 179 |
| 2012 | 5.8 | 181 |
| 2011 | 5.5 | 184 |
| 2010 | 5.2 | 184 |
| 2009 | 4.9 | 184 |
| 2008 | 4.7 | 184 |
| 2007 | 4.5 | 184 |
| 2006 | 4.3 | 184 |
| 2005 | 4.1 | 184 |
| 2004 | 4 | 185 |
| 2003 | 4 | 185 |
| 2002 | 4 | 185 |
| 2001 | 3.9 | 185 |
| 2000 | 3.9 | 185 |
| 1999 | 3.7 | 185 |
| 1998 | 3.5 | 185 |
| 1997 | 3.3 | 186 |
| 1996 | 3.2 | 187 |
| 1995 | 3.2 | 188 |
| 1991 | 4.1 | 183 |
| 1990 | 4.3 | 183 |
| 1989 | 4.3 | 182 |
| 1988 | 4.2 | 182 |
| 1987 | 4 | 182 |
| 1986 | 3.8 | 182 |