| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 94.9 | 106 |
| 2015 | 93.5 | 106 |
| 2014 | 92 | 103 |
| 2013 | 90.4 | 102 |
| 2012 | 88.8 | 102 |
| 2011 | 87.2 | 102 |
| 2010 | 85.6 | 103 |
| 2009 | 84 | 103 |
| 2008 | 82.5 | 103 |
| 2007 | 81 | 103 |
| 2006 | 79.6 | 104 |
| 2005 | 78.1 | 104 |
| 2004 | 76.6 | 103 |
| 2003 | 75.1 | 104 |
| 2002 | 73.7 | 105 |
| 2001 | 72.1 | 106 |
| 2000 | 70.6 | 106 |
| 1999 | 69 | 105 |
| 1998 | 67.3 | 106 |
| 1997 | 65.6 | 105 |
| 1996 | 64 | 105 |
| 1995 | 62.4 | 105 |
| 1994 | 60.8 | 104 |
| 1993 | 59.3 | 105 |
| 1992 | 57.9 | 107 |
| 1991 | 56.4 | 109 |
| 1990 | 54.9 | 107 |
| 1989 | 53.4 | 105 |
| 1988 | 51.8 | 106 |
| 1987 | 50.3 | 107 |
| 1986 | 48.8 | 109 |