| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 2 | 190 |
| 2015 | 2 | 190 |
| 2014 | 2 | 190 |
| 2013 | 2.1 | 191 |
| 2012 | 2.1 | 191 |
| 2011 | 2.2 | 192 |
| 2010 | 2.2 | 192 |
| 2009 | 2.3 | 192 |
| 2008 | 2.3 | 191 |
| 2007 | 2.4 | 190 |
| 2006 | 2.5 | 190 |
| 2005 | 2.6 | 190 |
| 2004 | 2.6 | 190 |
| 2003 | 2.7 | 190 |
| 2002 | 2.8 | 190 |
| 2001 | 2.9 | 189 |
| 2000 | 3 | 189 |
| 1999 | 3.1 | 187 |
| 1998 | 3.2 | 187 |
| 1997 | 3.3 | 187 |
| 1996 | 3.4 | 186 |
| 1995 | 3.4 | 185 |
| 1994 | 3.4 | 185 |
| 1993 | 3.4 | 185 |
| 1992 | 3.5 | 184 |
| 1991 | 3.5 | 185 |
| 1990 | 3.4 | 186 |
| 1989 | 3.4 | 185 |
| 1988 | 3.4 | 185 |
| 1987 | 3.4 | 185 |
| 1986 | 3.5 | 184 |