| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 68.2 | 132 |
| 2015 | 66.2 | 132 |
| 2014 | 64.3 | 131 |
| 2013 | 62.4 | 133 |
| 2012 | 60.6 | 133 |
| 2011 | 58.8 | 133 |
| 2010 | 57 | 133 |
| 2009 | 55.3 | 133 |
| 2008 | 53.7 | 133 |
| 2007 | 52.1 | 133 |
| 2006 | 50.5 | 134 |
| 2005 | 49.1 | 135 |
| 2004 | 47.6 | 137 |
| 2003 | 46.3 | 136 |
| 2002 | 44.9 | 137 |
| 2001 | 43.7 | 138 |
| 2000 | 42.4 | 138 |
| 1999 | 41.2 | 136 |
| 1998 | 40.1 | 138 |
| 1997 | 39 | 138 |
| 1996 | 37.9 | 138 |
| 1995 | 36.9 | 139 |
| 1994 | 35.9 | 139 |
| 1993 | 34.9 | 140 |
| 1992 | 34 | 140 |
| 1991 | 33.1 | 142 |
| 1990 | 32.2 | 139 |
| 1989 | 31.4 | 137 |
| 1988 | 30.5 | 137 |
| 1987 | 29.8 | 137 |
| 1986 | 29 | 137 |