| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 69.3 | 129 |
| 2015 | 67.9 | 131 |
| 2014 | 67 | 128 |
| 2013 | 66.7 | 129 |
| 2012 | 66.6 | 130 |
| 2011 | 66.4 | 128 |
| 2010 | 66.2 | 128 |
| 2009 | 65.8 | 126 |
| 2008 | 65.2 | 126 |
| 2007 | 63.9 | 127 |
| 2006 | 62 | 128 |
| 2005 | 60.4 | 127 |
| 2004 | 59.1 | 127 |
| 2003 | 58 | 127 |
| 2002 | 57.1 | 125 |
| 2001 | 56.1 | 125 |
| 2000 | 55.2 | 126 |
| 1999 | 54.5 | 123 |
| 1998 | 53.9 | 123 |
| 1997 | 53.3 | 122 |
| 1996 | 52.8 | 121 |
| 1995 | 52.4 | 119 |
| 1994 | 52.1 | 118 |
| 1993 | 51.9 | 117 |
| 1992 | 51.7 | 116 |
| 1991 | 51.3 | 116 |
| 1990 | 51 | 111 |
| 1989 | 51 | 109 |
| 1988 | 51.2 | 107 |
| 1987 | 51.4 | 105 |
| 1986 | 51.4 | 105 |