| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 74.5 | 125 |
| 2015 | 75.1 | 124 |
| 2014 | 75.7 | 118 |
| 2013 | 76 | 117 |
| 2012 | 76.3 | 114 |
| 2011 | 76.5 | 112 |
| 2010 | 78.9 | 111 |
| 2009 | 79.1 | 110 |
| 2008 | 79.2 | 108 |
| 2007 | 79.3 | 107 |
| 2006 | 79.3 | 105 |
| 2005 | 79.4 | 102 |
| 2004 | 79.3 | 102 |
| 2003 | 79.4 | 102 |
| 2002 | 79.4 | 102 |
| 2001 | 79.4 | 101 |
| 2000 | 79.2 | 101 |
| 1999 | 81.5 | 95 |
| 1998 | 80.5 | 96 |
| 1997 | 81.7 | 94 |
| 1996 | 80.3 | 95 |
| 1995 | 83.5 | 91 |
| 1994 | 83.2 | 91 |
| 1993 | 83 | 91 |
| 1992 | 79.9 | 93 |
| 1991 | 80.7 | 93 |
| 1990 | 85.5 | 88 |
| 1989 | 85.3 | 84 |
| 1988 | 85.1 | 82 |
| 1987 | 84.8 | 81 |
| 1986 | 84.5 | 79 |