| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 10.1 | 198 |
| 2015 | 9.9 | 198 |
| 2014 | 9.7 | 195 |
| 2013 | 9.6 | 195 |
| 2012 | 9.5 | 195 |
| 2011 | 9.3 | 196 |
| 2010 | 9.2 | 196 |
| 2009 | 9 | 196 |
| 2008 | 8.9 | 195 |
| 2007 | 8.7 | 195 |
| 2006 | 8.6 | 195 |
| 2005 | 8.4 | 195 |
| 2004 | 8.3 | 195 |
| 2003 | 8.1 | 195 |
| 2002 | 8 | 195 |
| 2001 | 7.8 | 195 |
| 2000 | 7.7 | 195 |
| 1999 | 7.6 | 193 |
| 1998 | 7.4 | 193 |
| 1997 | 7.3 | 193 |
| 1996 | 7.1 | 193 |
| 1995 | 7 | 193 |
| 1994 | 6.8 | 192 |
| 1993 | 6.7 | 191 |
| 1992 | 6.6 | 190 |
| 1991 | 6.5 | 191 |
| 1990 | 6.3 | 187 |
| 1989 | 6.2 | 185 |
| 1988 | 6.1 | 185 |
| 1987 | 6 | 185 |
| 1986 | 5.9 | 185 |