| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 42.8 | 156 |
| 2015 | 41.7 | 156 |
| 2014 | 40.5 | 152 |
| 2013 | 39.5 | 152 |
| 2012 | 38.4 | 152 |
| 2011 | 37.4 | 153 |
| 2010 | 36.4 | 155 |
| 2009 | 35.4 | 156 |
| 2008 | 34.4 | 158 |
| 2007 | 33.4 | 158 |
| 2006 | 32.5 | 159 |
| 2005 | 31.5 | 160 |
| 2004 | 30.6 | 160 |
| 2003 | 29.7 | 160 |
| 2002 | 28.8 | 160 |
| 2001 | 28 | 161 |
| 2000 | 27.1 | 161 |
| 1999 | 26.3 | 159 |
| 1998 | 25.5 | 159 |
| 1997 | 24.7 | 157 |
| 1996 | 23.9 | 158 |
| 1995 | 23.2 | 158 |
| 1994 | 22.5 | 157 |
| 1993 | 21.8 | 157 |
| 1992 | 21.2 | 156 |
| 1991 | 20.5 | 158 |
| 1990 | 19.9 | 155 |
| 1989 | 19.4 | 153 |
| 1988 | 18.8 | 153 |
| 1987 | 18.3 | 153 |
| 1986 | 17.8 | 152 |