| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 85.1 | 112 |
| 2015 | 83 | 113 |
| 2014 | 80.9 | 111 |
| 2013 | 78.8 | 112 |
| 2012 | 76.7 | 113 |
| 2011 | 74.7 | 115 |
| 2010 | 72.7 | 118 |
| 2009 | 70.7 | 119 |
| 2008 | 68.8 | 121 |
| 2007 | 66.9 | 121 |
| 2006 | 65.1 | 122 |
| 2005 | 63.3 | 124 |
| 2004 | 61.6 | 124 |
| 2003 | 60 | 124 |
| 2002 | 58.4 | 124 |
| 2001 | 56.8 | 124 |
| 2000 | 55.3 | 125 |
| 1999 | 53.8 | 124 |
| 1998 | 52.3 | 124 |
| 1997 | 50.9 | 123 |
| 1996 | 49.5 | 124 |
| 1995 | 48 | 125 |
| 1994 | 46.6 | 124 |
| 1993 | 45.3 | 125 |
| 1992 | 43.9 | 125 |
| 1991 | 42.5 | 127 |
| 1990 | 41.1 | 124 |
| 1989 | 39.8 | 123 |
| 1988 | 38.4 | 123 |
| 1987 | 37.1 | 124 |
| 1986 | 35.8 | 125 |