| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 15.2 | 190 |
| 2015 | 14.9 | 190 |
| 2014 | 14.7 | 187 |
| 2013 | 14.4 | 187 |
| 2012 | 14.2 | 186 |
| 2011 | 13.9 | 187 |
| 2010 | 13.7 | 187 |
| 2009 | 13.4 | 187 |
| 2008 | 13.2 | 187 |
| 2007 | 13 | 187 |
| 2006 | 12.9 | 186 |
| 2005 | 12.6 | 187 |
| 2004 | 12.5 | 187 |
| 2003 | 12.3 | 187 |
| 2002 | 12.1 | 187 |
| 2001 | 11.9 | 187 |
| 2000 | 11.7 | 187 |
| 1999 | 11.4 | 185 |
| 1998 | 11.2 | 185 |
| 1997 | 11 | 184 |
| 1996 | 10.8 | 184 |
| 1995 | 10.6 | 184 |
| 1994 | 10.4 | 183 |
| 1993 | 10.1 | 183 |
| 1992 | 9.8 | 182 |
| 1991 | 9.6 | 183 |
| 1990 | 9.3 | 180 |
| 1989 | 9.1 | 178 |
| 1988 | 9 | 179 |
| 1987 | 8.8 | 179 |
| 1986 | 8.6 | 178 |