| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 38.9 | 156 |
| 2015 | 38 | 156 |
| 2014 | 36.9 | 156 |
| 2013 | 36.2 | 156 |
| 2012 | 35.1 | 156 |
| 2011 | 35.5 | 157 |
| 2010 | 35.2 | 157 |
| 2009 | 34.8 | 157 |
| 2008 | 34 | 157 |
| 2007 | 33 | 156 |
| 2006 | 32 | 158 |
| 2005 | 30.8 | 158 |
| 2004 | 29.2 | 158 |
| 2003 | 27.6 | 159 |
| 2002 | 25.8 | 159 |
| 2001 | 24.1 | 161 |
| 2000 | 22.5 | 161 |
| 1999 | 21.3 | 161 |
| 1998 | 20.3 | 162 |
| 1997 | 19.5 | 162 |
| 1996 | 18.8 | 162 |
| 1995 | 18.4 | 161 |
| 1994 | 18.6 | 160 |
| 1993 | 18.9 | 160 |
| 1992 | 19.3 | 160 |
| 1991 | 19.6 | 161 |
| 1990 | 19.8 | 161 |