| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 35.8 | 162 |
| 2015 | 35.3 | 162 |
| 2014 | 34.8 | 159 |
| 2013 | 34.4 | 160 |
| 2012 | 33.9 | 160 |
| 2011 | 33.4 | 160 |
| 2010 | 32.9 | 161 |
| 2009 | 32.4 | 161 |
| 2008 | 31.9 | 160 |
| 2007 | 31.4 | 161 |
| 2006 | 30.9 | 161 |
| 2005 | 30.4 | 161 |
| 2004 | 29.8 | 161 |
| 2003 | 29.3 | 161 |
| 2002 | 28.8 | 161 |
| 2001 | 28.3 | 160 |
| 2000 | 27.8 | 160 |
| 1999 | 27.2 | 158 |
| 1998 | 26.7 | 157 |
| 1997 | 26.2 | 156 |
| 1996 | 25.7 | 156 |
| 1995 | 25.2 | 156 |
| 1994 | 24.6 | 155 |
| 1993 | 24.1 | 154 |
| 1992 | 23.6 | 153 |
| 1991 | 23.1 | 155 |
| 1990 | 22.5 | 151 |
| 1989 | 22 | 149 |
| 1988 | 21.4 | 149 |
| 1987 | 20.9 | 149 |
| 1986 | 20.4 | 149 |