| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 65.6 | 135 |
| 2015 | 64.8 | 136 |
| 2014 | 63.9 | 133 |
| 2013 | 63 | 132 |
| 2012 | 62.2 | 131 |
| 2011 | 61.3 | 131 |
| 2010 | 60.4 | 131 |
| 2009 | 59.4 | 131 |
| 2008 | 58.5 | 131 |
| 2007 | 57.5 | 131 |
| 2006 | 56.6 | 131 |
| 2005 | 55.8 | 130 |
| 2004 | 55 | 130 |
| 2003 | 54.3 | 131 |
| 2002 | 53.7 | 131 |
| 2001 | 53 | 130 |
| 2000 | 52.3 | 129 |
| 1999 | 51.6 | 126 |
| 1998 | 50.8 | 125 |
| 1997 | 50 | 124 |
| 1996 | 49.2 | 125 |
| 1995 | 48.4 | 124 |
| 1994 | 47.5 | 123 |
| 1993 | 46.6 | 123 |
| 1992 | 45.7 | 122 |
| 1991 | 44.8 | 124 |
| 1990 | 43.9 | 121 |
| 1989 | 43.1 | 117 |
| 1988 | 42.2 | 118 |
| 1987 | 41.4 | 118 |
| 1986 | 40.6 | 118 |