| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 85.7 | 109 |
| 2015 | 83.2 | 112 |
| 2014 | 80.6 | 112 |
| 2013 | 78 | 114 |
| 2012 | 75.5 | 117 |
| 2011 | 73 | 119 |
| 2010 | 70.8 | 120 |
| 2009 | 68.8 | 121 |
| 2008 | 66.6 | 124 |
| 2007 | 64.9 | 125 |
| 2006 | 63.3 | 125 |
| 2005 | 61.8 | 125 |
| 2004 | 60.2 | 126 |
| 2003 | 58.6 | 126 |
| 2002 | 57 | 126 |
| 2001 | 55.4 | 126 |
| 2000 | 53.9 | 127 |
| 1999 | 52.3 | 125 |
| 1998 | 50.7 | 126 |
| 1997 | 49.2 | 126 |
| 1996 | 47.7 | 126 |
| 1995 | 46.2 | 126 |
| 1994 | 44.8 | 126 |
| 1993 | 43.5 | 126 |
| 1992 | 42.2 | 127 |
| 1991 | 41 | 129 |
| 1990 | 39.9 | 127 |
| 1989 | 39 | 125 |
| 1988 | 38.1 | 125 |
| 1987 | 37.2 | 123 |
| 1986 | 36.4 | 123 |