| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 80.7 | 117 |
| 2015 | 81.1 | 115 |
| 2014 | 81.5 | 110 |
| 2013 | 81.9 | 109 |
| 2012 | 82.3 | 108 |
| 2011 | 82.7 | 107 |
| 2010 | 83.4 | 105 |
| 2009 | 83.7 | 104 |
| 2008 | 84 | 101 |
| 2007 | 84.4 | 100 |
| 2006 | 84.7 | 99 |
| 2005 | 85.1 | 98 |
| 2004 | 85.3 | 97 |
| 2003 | 85.5 | 96 |
| 2002 | 85.7 | 95 |
| 2001 | 85.8 | 94 |
| 2000 | 85.9 | 94 |
| 1999 | 86.2 | 92 |
| 1998 | 86.5 | 91 |
| 1997 | 86.9 | 90 |
| 1996 | 87.1 | 90 |
| 1995 | 87.2 | 90 |
| 1994 | 88.4 | 89 |
| 1993 | 88 | 89 |
| 1992 | 87.4 | 88 |
| 1991 | 86.8 | 88 |
| 1990 | 86.7 | 85 |