| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 3.6 | 208 |
| 2015 | 3.5 | 208 |
| 2014 | 3.5 | 204 |
| 2013 | 3.5 | 204 |
| 2012 | 3.5 | 204 |
| 2011 | 3.5 | 205 |
| 2010 | 3.5 | 204 |
| 2009 | 3.5 | 204 |
| 2008 | 3.4 | 203 |
| 2007 | 3.4 | 203 |
| 2006 | 3.3 | 203 |
| 2005 | 3.3 | 203 |
| 2004 | 3.2 | 203 |
| 2003 | 3.2 | 203 |
| 2002 | 3.1 | 203 |
| 2001 | 3.1 | 204 |
| 2000 | 3 | 204 |
| 1999 | 3 | 202 |
| 1998 | 3 | 202 |
| 1997 | 2.9 | 201 |
| 1996 | 2.9 | 201 |
| 1995 | 2.8 | 201 |
| 1994 | 2.8 | 200 |
| 1993 | 2.7 | 200 |
| 1992 | 2.6 | 199 |
| 1991 | 2.6 | 200 |
| 1990 | 2.5 | 198 |
| 1989 | 2.5 | 196 |
| 1988 | 2.4 | 196 |
| 1987 | 2.3 | 196 |
| 1986 | 2.3 | 196 |