| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 98.1 | 102 |
| 2015 | 97.5 | 102 |
| 2014 | 97 | 99 |
| 2013 | 96.5 | 96 |
| 2012 | 96.1 | 96 |
| 2011 | 95.6 | 95 |
| 2010 | 95.3 | 95 |
| 2009 | 95 | 94 |
| 2008 | 94.8 | 94 |
| 2007 | 94.6 | 94 |
| 2006 | 94.4 | 93 |
| 2005 | 94.2 | 93 |
| 2004 | 93.8 | 92 |
| 2003 | 93.5 | 93 |
| 2002 | 93.1 | 92 |
| 2001 | 92.9 | 92 |
| 2000 | 92.9 | 91 |
| 1999 | 93.2 | 89 |
| 1998 | 93.7 | 89 |
| 1997 | 94.3 | 87 |
| 1996 | 94.9 | 85 |
| 1995 | 95.2 | 85 |
| 1994 | 95.2 | 82 |
| 1993 | 94.9 | 82 |
| 1992 | 94.6 | 81 |
| 1991 | 94.5 | 80 |
| 1990 | 94.6 | 78 |
| 1989 | 95 | 77 |
| 1988 | 95.7 | 75 |
| 1987 | 96.5 | 73 |
| 1986 | 97.4 | 72 |