| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 80.3 | 118 |
| 2015 | 79.2 | 118 |
| 2014 | 78.1 | 116 |
| 2013 | 77 | 116 |
| 2012 | 75.9 | 116 |
| 2011 | 74.8 | 114 |
| 2010 | 73.7 | 114 |
| 2009 | 72.8 | 115 |
| 2008 | 72 | 115 |
| 2007 | 71.1 | 116 |
| 2006 | 70.3 | 115 |
| 2005 | 69.3 | 115 |
| 2004 | 68.2 | 114 |
| 2003 | 67.1 | 113 |
| 2002 | 65.8 | 114 |
| 2001 | 64.5 | 114 |
| 2000 | 63.2 | 114 |
| 1999 | 61.9 | 111 |
| 1998 | 60.6 | 113 |
| 1997 | 59.2 | 114 |
| 1996 | 57.8 | 115 |
| 1995 | 56.4 | 116 |
| 1994 | 54.9 | 115 |
| 1993 | 53.5 | 116 |
| 1992 | 52 | 115 |
| 1991 | 50.5 | 117 |
| 1990 | 49.1 | 116 |
| 1989 | 47.7 | 114 |
| 1988 | 46.4 | 114 |
| 1987 | 45.1 | 114 |
| 1986 | 43.8 | 114 |