| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 96.1 | 104 |
| 2015 | 94.2 | 103 |
| 2014 | 92.2 | 102 |
| 2013 | 90.2 | 103 |
| 2012 | 88.2 | 103 |
| 2011 | 86.3 | 103 |
| 2010 | 84.5 | 104 |
| 2009 | 82.8 | 105 |
| 2008 | 81.3 | 106 |
| 2007 | 79.9 | 106 |
| 2006 | 78.5 | 107 |
| 2005 | 77.1 | 105 |
| 2004 | 75.7 | 104 |
| 2003 | 74.3 | 105 |
| 2002 | 72.9 | 106 |
| 2001 | 71.6 | 107 |
| 2000 | 70.2 | 108 |
| 1999 | 68.9 | 106 |
| 1998 | 67.7 | 105 |
| 1997 | 66.5 | 104 |
| 1996 | 65.2 | 104 |
| 1995 | 64 | 104 |
| 1994 | 62.8 | 103 |
| 1993 | 61.6 | 103 |
| 1992 | 60.3 | 103 |
| 1991 | 59 | 106 |
| 1990 | 57.7 | 104 |
| 1989 | 56.3 | 103 |
| 1988 | 54.8 | 103 |
| 1987 | 53.3 | 103 |
| 1986 | 51.8 | 103 |