| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 47.9 | 148 |
| 2015 | 46.7 | 149 |
| 2014 | 45.6 | 149 |
| 2013 | 44.5 | 149 |
| 2012 | 43.4 | 149 |
| 2011 | 42.3 | 151 |
| 2010 | 41 | 152 |
| 2009 | 39.6 | 152 |
| 2008 | 38 | 152 |
| 2007 | 36.5 | 152 |
| 2006 | 35 | 153 |
| 2005 | 33.9 | 154 |
| 2004 | 33 | 156 |
| 2003 | 32.4 | 156 |
| 2002 | 31.8 | 157 |
| 2001 | 31.1 | 158 |
| 2000 | 29.9 | 158 |
| 1999 | 28.4 | 157 |
| 1998 | 26.5 | 158 |
| 1997 | 24.5 | 159 |
| 1996 | 22.7 | 159 |
| 1995 | 21.5 | 159 |
| 1994 | 20.9 | 159 |
| 1993 | 20.8 | 159 |
| 1992 | 21 | 158 |
| 1991 | 21.4 | 156 |
| 1990 | 21.8 | 153 |
| 1989 | 22.1 | 148 |
| 1988 | 22.5 | 147 |
| 1987 | 22.7 | 144 |
| 1986 | 22.9 | 144 |