| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 65.7 | 134 |
| 2015 | 66.1 | 133 |
| 2014 | 66.5 | 129 |
| 2013 | 66.9 | 128 |
| 2012 | 67.3 | 127 |
| 2011 | 67.7 | 127 |
| 2010 | 68.1 | 124 |
| 2009 | 68.6 | 123 |
| 2008 | 69 | 120 |
| 2007 | 69.5 | 119 |
| 2006 | 70 | 116 |
| 2005 | 70.5 | 113 |
| 2004 | 71 | 111 |
| 2003 | 71.5 | 111 |
| 2002 | 72 | 108 |
| 2001 | 72.4 | 105 |
| 2000 | 73.9 | 104 |
| 1999 | 74.2 | 102 |
| 1998 | 74.6 | 101 |
| 1997 | 75.1 | 100 |
| 1996 | 75.6 | 99 |
| 1995 | 76 | 99 |
| 1994 | 76.3 | 97 |
| 1993 | 76.6 | 96 |
| 1992 | 77.2 | 96 |
| 1991 | 78 | 96 |
| 1990 | 78.8 | 93 |
| 1989 | 80.2 | 90 |
| 1988 | 81.2 | 89 |
| 1987 | 81.1 | 85 |
| 1986 | 81 | 83 |