| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 85.6 | 110 |
| 2015 | 86.1 | 109 |
| 2014 | 86.5 | 105 |
| 2013 | 86.9 | 105 |
| 2012 | 87.2 | 104 |
| 2011 | 87.5 | 101 |
| 2010 | 88 | 100 |
| 2009 | 88.5 | 98 |
| 2008 | 89.3 | 97 |
| 2007 | 90.8 | 95 |
| 2006 | 92.2 | 94 |
| 2005 | 92.7 | 94 |
| 2004 | 93.3 | 93 |
| 2003 | 93.8 | 92 |
| 2002 | 94.5 | 91 |
| 2001 | 96.3 | 90 |
| 2000 | 97.7 | 88 |
| 1999 | 97.9 | 86 |
| 1998 | 98 | 86 |
| 1997 | 98.3 | 83 |
| 1996 | 98.5 | 82 |
| 1995 | 98.8 | 79 |
| 1994 | 99 | 79 |
| 1993 | 99.2 | 78 |
| 1992 | 99.3 | 77 |
| 1991 | 100.2 | 77 |
| 1990 | 101.2 | 73 |
| 1989 | 101 | 71 |
| 1988 | 100.1 | 70 |
| 1987 | 99.6 | 70 |
| 1986 | 99.2 | 69 |