| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 36.7 | 160 |
| 2015 | 36.1 | 160 |
| 2014 | 35.5 | 157 |
| 2013 | 34.9 | 158 |
| 2012 | 34.1 | 159 |
| 2011 | 33.4 | 161 |
| 2010 | 32.6 | 162 |
| 2009 | 31.8 | 162 |
| 2008 | 31 | 162 |
| 2007 | 30.1 | 162 |
| 2006 | 29.1 | 162 |
| 2005 | 27.8 | 162 |
| 2004 | 26.3 | 163 |
| 2003 | 24.6 | 165 |
| 2002 | 22.9 | 166 |
| 2001 | 21.2 | 169 |
| 2000 | 19.9 | 171 |
| 1999 | 18.8 | 170 |
| 1998 | 18 | 170 |
| 1997 | 17.4 | 169 |
| 1996 | 16.8 | 170 |
| 1995 | 16.1 | 170 |
| 1994 | 15.4 | 169 |
| 1993 | 14.5 | 169 |
| 1992 | 13.7 | 168 |
| 1991 | 12.8 | 170 |
| 1990 | 12.2 | 167 |
| 1989 | 11.6 | 168 |
| 1988 | 11.1 | 169 |
| 1987 | 10.8 | 169 |
| 1986 | 10.4 | 169 |