| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 106 | 94 |
| 2015 | 104.6 | 94 |
| 2014 | 103.5 | 92 |
| 2013 | 102.7 | 92 |
| 2012 | 102.1 | 93 |
| 2011 | 101.6 | 93 |
| 2010 | 101.3 | 92 |
| 2009 | 101 | 93 |
| 2008 | 100.8 | 92 |
| 2007 | 100.5 | 91 |
| 2006 | 100.1 | 90 |
| 2005 | 99.6 | 90 |
| 2004 | 99 | 90 |
| 2003 | 98.3 | 90 |
| 2002 | 97.9 | 89 |
| 2001 | 97.4 | 89 |
| 2000 | 97 | 90 |
| 1999 | 96.8 | 87 |
| 1998 | 96.6 | 87 |
| 1997 | 96.5 | 84 |
| 1996 | 96.4 | 84 |
| 1995 | 96.2 | 83 |
| 1994 | 96.1 | 81 |
| 1993 | 95.7 | 81 |
| 1992 | 94.9 | 80 |
| 1991 | 93.9 | 81 |
| 1990 | 93 | 79 |
| 1989 | 92.3 | 78 |
| 1988 | 91.9 | 77 |
| 1987 | 91.7 | 76 |
| 1986 | 91.7 | 76 |