| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 43.5 | 155 |
| 2015 | 41.9 | 155 |
| 2014 | 40.3 | 153 |
| 2013 | 38.6 | 155 |
| 2012 | 37 | 156 |
| 2011 | 35.4 | 157 |
| 2010 | 33.9 | 158 |
| 2009 | 32.4 | 160 |
| 2008 | 31 | 163 |
| 2007 | 29.6 | 163 |
| 2006 | 28.2 | 163 |
| 2005 | 27 | 163 |
| 2004 | 25.8 | 164 |
| 2003 | 24.8 | 164 |
| 2002 | 23.8 | 165 |
| 2001 | 22.8 | 165 |
| 2000 | 21.9 | 165 |
| 1999 | 21 | 164 |
| 1998 | 20.2 | 165 |
| 1997 | 19.4 | 165 |
| 1996 | 18.7 | 167 |
| 1995 | 18 | 168 |
| 1994 | 17.4 | 167 |
| 1993 | 16.8 | 167 |
| 1992 | 16.2 | 167 |
| 1991 | 15.7 | 168 |
| 1990 | 15.2 | 165 |
| 1989 | 14.8 | 162 |
| 1988 | 14.3 | 162 |
| 1987 | 13.9 | 162 |
| 1986 | 13.4 | 163 |