| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 78.1 | 121 |
| 2015 | 76.7 | 122 |
| 2014 | 75.3 | 120 |
| 2013 | 73.9 | 120 |
| 2012 | 72.6 | 120 |
| 2011 | 71.2 | 121 |
| 2010 | 69.9 | 121 |
| 2009 | 68.6 | 122 |
| 2008 | 67.4 | 122 |
| 2007 | 66.2 | 123 |
| 2006 | 65.1 | 121 |
| 2005 | 64.3 | 121 |
| 2004 | 63.7 | 121 |
| 2003 | 63.2 | 118 |
| 2002 | 62.8 | 117 |
| 2001 | 62.4 | 117 |
| 2000 | 61.7 | 116 |
| 1999 | 60.8 | 116 |
| 1998 | 59.7 | 116 |
| 1997 | 58.4 | 116 |
| 1996 | 57.1 | 117 |
| 1995 | 55.9 | 117 |
| 1994 | 54.8 | 116 |
| 1993 | 53.7 | 114 |
| 1992 | 52.7 | 114 |
| 1991 | 51.5 | 115 |
| 1990 | 50.1 | 115 |
| 1989 | 48.4 | 113 |
| 1988 | 46.5 | 113 |
| 1987 | 44.6 | 116 |
| 1986 | 42.7 | 116 |