| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 74.9 | 124 |
| 2015 | 73.6 | 125 |
| 2014 | 72.3 | 122 |
| 2013 | 71.1 | 122 |
| 2012 | 70 | 124 |
| 2011 | 69 | 124 |
| 2010 | 67.1 | 126 |
| 2009 | 65.3 | 128 |
| 2008 | 64.2 | 128 |
| 2007 | 63.2 | 128 |
| 2006 | 62.3 | 127 |
| 2005 | 61.5 | 126 |
| 2004 | 60.8 | 125 |
| 2003 | 60.1 | 123 |
| 2002 | 59.4 | 123 |
| 2001 | 58.7 | 123 |
| 2000 | 57.9 | 122 |
| 1999 | 57.2 | 119 |
| 1998 | 56.5 | 120 |
| 1997 | 55.6 | 119 |
| 1996 | 54.6 | 118 |
| 1995 | 53.6 | 118 |
| 1994 | 52.6 | 117 |
| 1993 | 51.6 | 118 |
| 1992 | 50.4 | 117 |
| 1991 | 49.3 | 119 |
| 1990 | 48.2 | 117 |
| 1989 | 47 | 115 |
| 1988 | 45.8 | 115 |
| 1987 | 44.7 | 115 |
| 1986 | 43.6 | 115 |