| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 95.1 | 105 |
| 2015 | 94.2 | 104 |
| 2014 | 93.2 | 100 |
| 2013 | 92.2 | 101 |
| 2012 | 91.2 | 100 |
| 2011 | 90.1 | 99 |
| 2010 | 89 | 99 |
| 2009 | 87.9 | 99 |
| 2008 | 86.8 | 98 |
| 2007 | 85.6 | 99 |
| 2006 | 84.4 | 100 |
| 2005 | 83.2 | 99 |
| 2004 | 82 | 99 |
| 2003 | 80.8 | 100 |
| 2002 | 79.6 | 101 |
| 2001 | 78.3 | 102 |
| 2000 | 76.9 | 103 |
| 1999 | 75.4 | 101 |
| 1998 | 73.8 | 102 |
| 1997 | 72.1 | 102 |
| 1996 | 70.4 | 102 |
| 1995 | 68.8 | 102 |
| 1994 | 67.1 | 101 |
| 1993 | 65.4 | 101 |
| 1992 | 63.8 | 102 |
| 1991 | 62.2 | 103 |
| 1990 | 60.6 | 101 |
| 1989 | 59.1 | 99 |
| 1988 | 57.7 | 100 |
| 1987 | 56.3 | 101 |
| 1986 | 54.9 | 101 |