| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 89.3 | 108 |
| 2015 | 87.9 | 108 |
| 2014 | 86.5 | 106 |
| 2013 | 85.1 | 106 |
| 2012 | 83.7 | 107 |
| 2011 | 82.4 | 108 |
| 2010 | 81.1 | 108 |
| 2009 | 79.8 | 107 |
| 2008 | 78.6 | 109 |
| 2007 | 77.5 | 108 |
| 2006 | 76.3 | 108 |
| 2005 | 75.2 | 107 |
| 2004 | 74 | 108 |
| 2003 | 72.8 | 108 |
| 2002 | 71.6 | 109 |
| 2001 | 70.3 | 109 |
| 2000 | 68.8 | 109 |
| 1999 | 67.3 | 107 |
| 1998 | 65.7 | 107 |
| 1997 | 64 | 106 |
| 1996 | 62.2 | 106 |
| 1995 | 60.4 | 107 |
| 1994 | 58.4 | 108 |
| 1993 | 56.5 | 111 |
| 1992 | 54.5 | 112 |
| 1991 | 52.6 | 113 |
| 1990 | 50.8 | 112 |
| 1989 | 49.2 | 111 |
| 1988 | 47.8 | 112 |
| 1987 | 46.4 | 112 |
| 1986 | 45.1 | 113 |