| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 68.7 | 131 |
| 2015 | 69.1 | 129 |
| 2014 | 69.6 | 126 |
| 2013 | 70.4 | 124 |
| 2012 | 71.3 | 121 |
| 2011 | 72 | 120 |
| 2010 | 72.7 | 117 |
| 2009 | 73.2 | 114 |
| 2008 | 73.5 | 113 |
| 2007 | 73.7 | 111 |
| 2006 | 73.8 | 110 |
| 2005 | 73.9 | 110 |
| 2004 | 73.9 | 109 |
| 2003 | 73.8 | 106 |
| 2002 | 73.7 | 104 |
| 2001 | 73.7 | 104 |
| 2000 | 73.6 | 105 |
| 1999 | 73.4 | 103 |
| 1998 | 73.3 | 103 |
| 1997 | 73.3 | 101 |
| 1996 | 73.8 | 101 |
| 1995 | 75.1 | 100 |
| 1994 | 77.1 | 95 |
| 1993 | 79.8 | 93 |
| 1992 | 82.8 | 91 |
| 1991 | 85.7 | 90 |
| 1990 | 87.5 | 83 |
| 1989 | 88.4 | 80 |
| 1988 | 88.4 | 80 |
| 1987 | 87.8 | 79 |
| 1986 | 87 | 78 |