| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 12 | 196 |
| 2015 | 11.8 | 196 |
| 2014 | 11.6 | 193 |
| 2013 | 11.4 | 193 |
| 2012 | 11.2 | 192 |
| 2011 | 11 | 193 |
| 2010 | 10.8 | 193 |
| 2009 | 10.7 | 193 |
| 2008 | 10.5 | 193 |
| 2007 | 10.4 | 193 |
| 2006 | 10.2 | 193 |
| 2005 | 10.1 | 193 |
| 2004 | 10 | 193 |
| 2003 | 9.9 | 192 |
| 2002 | 9.8 | 191 |
| 2001 | 9.7 | 190 |
| 2000 | 9.6 | 190 |
| 1999 | 9.5 | 187 |
| 1998 | 9.4 | 187 |
| 1997 | 9.3 | 186 |
| 1996 | 9.1 | 186 |
| 1995 | 9 | 187 |
| 1994 | 8.8 | 186 |
| 1993 | 8.5 | 186 |
| 1992 | 8.3 | 185 |
| 1991 | 8.1 | 186 |
| 1990 | 7.8 | 183 |
| 1989 | 7.6 | 181 |
| 1988 | 7.4 | 181 |
| 1987 | 7.3 | 181 |
| 1986 | 7.1 | 181 |