| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 92.8 | 107 |
| 2015 | 92.9 | 107 |
| 2014 | 92.9 | 101 |
| 2013 | 93.2 | 100 |
| 2012 | 93.5 | 98 |
| 2011 | 93.5 | 97 |
| 2010 | 93.2 | 97 |
| 2009 | 93 | 95 |
| 2008 | 92.1 | 95 |
| 2007 | 90.6 | 96 |
| 2006 | 89 | 96 |
| 2005 | 87.5 | 96 |
| 2004 | 86 | 96 |
| 2003 | 84.5 | 98 |
| 2002 | 83 | 99 |
| 2001 | 81.9 | 99 |
| 2000 | 81.3 | 99 |
| 1999 | 80.9 | 98 |
| 1998 | 80.5 | 95 |
| 1997 | 80.2 | 95 |
| 1996 | 79.9 | 96 |
| 1995 | 79.5 | 94 |
| 1994 | 79.2 | 93 |
| 1993 | 78.8 | 94 |
| 1992 | 78.4 | 94 |
| 1991 | 78 | 97 |
| 1990 | 77.8 | 95 |
| 1989 | 77.7 | 93 |
| 1988 | 77.6 | 93 |
| 1987 | 77.5 | 93 |
| 1986 | 77.3 | 90 |