| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 82.5 | 114 |
| 2015 | 82.4 | 114 |
| 2014 | 82.4 | 108 |
| 2013 | 82.3 | 108 |
| 2012 | 82.2 | 109 |
| 2011 | 82.2 | 109 |
| 2010 | 82.1 | 106 |
| 2009 | 82 | 106 |
| 2008 | 81.9 | 105 |
| 2007 | 81.9 | 102 |
| 2006 | 81.1 | 101 |
| 2005 | 81 | 101 |
| 2004 | 80.9 | 101 |
| 2003 | 80.7 | 101 |
| 2002 | 80.6 | 100 |
| 2001 | 80.3 | 100 |
| 2000 | 80 | 100 |
| 1999 | 79.6 | 99 |
| 1998 | 79.1 | 99 |
| 1997 | 78.6 | 97 |
| 1996 | 78.2 | 97 |
| 1995 | 78 | 97 |
| 1994 | 77.9 | 94 |
| 1993 | 78 | 95 |
| 1992 | 78.2 | 95 |
| 1991 | 78.4 | 95 |
| 1990 | 78.5 | 94 |
| 1989 | 78.5 | 91 |
| 1988 | 78.5 | 91 |
| 1987 | 78.3 | 90 |
| 1986 | 78.2 | 88 |