| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 14.3 | 194 |
| 2015 | 14.2 | 194 |
| 2014 | 14.1 | 190 |
| 2013 | 13.9 | 190 |
| 2012 | 13.7 | 188 |
| 2011 | 13.6 | 188 |
| 2010 | 13.4 | 188 |
| 2009 | 13.2 | 188 |
| 2008 | 13.1 | 188 |
| 2007 | 12.9 | 188 |
| 2006 | 12.8 | 187 |
| 2005 | 12.7 | 186 |
| 2004 | 12.6 | 186 |
| 2003 | 12.5 | 186 |
| 2002 | 12.4 | 186 |
| 2001 | 12.4 | 186 |
| 2000 | 12.3 | 186 |
| 1999 | 12.2 | 183 |
| 1998 | 12.1 | 183 |
| 1997 | 12.1 | 182 |
| 1996 | 12 | 181 |
| 1995 | 11.9 | 181 |
| 1994 | 11.9 | 179 |
| 1993 | 11.8 | 176 |
| 1992 | 11.7 | 174 |
| 1991 | 11.7 | 174 |
| 1990 | 11.6 | 171 |
| 1989 | 11.6 | 169 |
| 1988 | 11.5 | 166 |
| 1987 | 11.5 | 165 |
| 1986 | 11.4 | 165 |