| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 11.5 | 197 |
| 2015 | 11.1 | 197 |
| 2014 | 10.8 | 194 |
| 2013 | 10.4 | 194 |
| 2012 | 10.1 | 194 |
| 2011 | 9.8 | 195 |
| 2010 | 9.4 | 195 |
| 2009 | 9.1 | 195 |
| 2008 | 8.8 | 196 |
| 2007 | 8.6 | 197 |
| 2006 | 8.3 | 197 |
| 2005 | 8 | 197 |
| 2004 | 7.7 | 197 |
| 2003 | 7.4 | 197 |
| 2002 | 7.1 | 197 |
| 2001 | 6.9 | 197 |
| 2000 | 6.6 | 197 |
| 1999 | 6.4 | 195 |
| 1998 | 6.2 | 195 |
| 1997 | 6 | 194 |
| 1996 | 5.8 | 195 |
| 1995 | 5.6 | 195 |
| 1994 | 5.4 | 194 |
| 1993 | 5.2 | 194 |
| 1992 | 5 | 193 |
| 1991 | 4.9 | 194 |
| 1990 | 4.7 | 191 |
| 1989 | 4.6 | 190 |
| 1988 | 4.4 | 190 |
| 1987 | 4.3 | 190 |
| 1986 | 4.2 | 190 |