| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 83.4 | 113 |
| 2015 | 83.9 | 110 |
| 2014 | 84.5 | 107 |
| 2013 | 85.1 | 107 |
| 2012 | 85.7 | 106 |
| 2011 | 86.2 | 104 |
| 2010 | 86.3 | 102 |
| 2009 | 86.2 | 101 |
| 2008 | 85.9 | 99 |
| 2007 | 85.7 | 98 |
| 2006 | 85.5 | 98 |
| 2005 | 85.2 | 97 |
| 2004 | 85 | 98 |
| 2003 | 84.8 | 97 |
| 2002 | 84.6 | 97 |
| 2001 | 84.3 | 96 |
| 2000 | 83.8 | 96 |
| 1999 | 83.5 | 94 |
| 1998 | 83.2 | 94 |
| 1997 | 82.7 | 92 |
| 1996 | 82.3 | 91 |
| 1995 | 81.9 | 93 |
| 1994 | 81.6 | 92 |
| 1993 | 81.2 | 92 |
| 1992 | 80.7 | 92 |
| 1991 | 80.1 | 94 |
| 1990 | 79.1 | 92 |
| 1989 | 78.3 | 92 |
| 1988 | 77.9 | 92 |
| 1987 | 77.6 | 92 |
| 1986 | 77.3 | 89 |