| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 79 | 120 |
| 2015 | 78 | 119 |
| 2014 | 76.9 | 117 |
| 2013 | 75.8 | 118 |
| 2012 | 74.7 | 118 |
| 2011 | 73.6 | 118 |
| 2010 | 72.6 | 119 |
| 2009 | 71.7 | 118 |
| 2008 | 70.8 | 117 |
| 2007 | 70 | 118 |
| 2006 | 69.2 | 117 |
| 2005 | 68.4 | 117 |
| 2004 | 67.6 | 115 |
| 2003 | 66.9 | 114 |
| 2002 | 66.1 | 113 |
| 2001 | 65.4 | 113 |
| 2000 | 64.6 | 112 |
| 1999 | 63.9 | 109 |
| 1998 | 63.1 | 108 |
| 1997 | 62.3 | 107 |
| 1996 | 61.5 | 107 |
| 1995 | 60.7 | 106 |
| 1994 | 59.8 | 105 |
| 1993 | 58.8 | 107 |
| 1992 | 57.8 | 108 |
| 1991 | 56.8 | 108 |
| 1990 | 55.7 | 106 |
| 1989 | 54.7 | 104 |
| 1988 | 53.7 | 104 |
| 1987 | 52.7 | 104 |
| 1986 | 51.6 | 104 |