| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 46.1 | 152 |
| 2015 | 45.3 | 153 |
| 2014 | 44.6 | 150 |
| 2013 | 43.9 | 150 |
| 2012 | 43.3 | 150 |
| 2011 | 42.6 | 150 |
| 2010 | 42 | 150 |
| 2009 | 41.4 | 149 |
| 2008 | 40.9 | 149 |
| 2007 | 40.3 | 149 |
| 2006 | 39.8 | 148 |
| 2005 | 39.2 | 147 |
| 2004 | 38.7 | 145 |
| 2003 | 38.3 | 145 |
| 2002 | 37.8 | 145 |
| 2001 | 37.4 | 146 |
| 2000 | 37 | 146 |
| 1999 | 36.5 | 143 |
| 1998 | 35.9 | 143 |
| 1997 | 35.4 | 142 |
| 1996 | 34.8 | 141 |
| 1995 | 34.1 | 141 |
| 1994 | 33.4 | 141 |
| 1993 | 32.7 | 142 |
| 1992 | 31.9 | 143 |
| 1991 | 31.1 | 144 |
| 1990 | 30.3 | 141 |
| 1989 | 29.6 | 139 |
| 1988 | 29 | 139 |
| 1987 | 28.4 | 139 |
| 1986 | 27.8 | 139 |