| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 7.7 | 200 |
| 2015 | 7.5 | 200 |
| 2014 | 7.3 | 197 |
| 2013 | 7.1 | 198 |
| 2012 | 6.8 | 198 |
| 2011 | 6.6 | 199 |
| 2010 | 6.4 | 199 |
| 2009 | 6.2 | 199 |
| 2008 | 6 | 199 |
| 2007 | 5.8 | 199 |
| 2006 | 5.6 | 200 |
| 2005 | 5.4 | 200 |
| 2004 | 5.3 | 200 |
| 2003 | 5.2 | 200 |
| 2002 | 5 | 200 |
| 2001 | 4.9 | 200 |
| 2000 | 4.8 | 200 |
| 1999 | 4.7 | 198 |
| 1998 | 4.5 | 198 |
| 1997 | 4.4 | 197 |
| 1996 | 4.3 | 197 |
| 1995 | 4.2 | 197 |
| 1994 | 4.1 | 196 |
| 1993 | 4 | 196 |
| 1992 | 3.9 | 195 |
| 1991 | 3.8 | 196 |
| 1990 | 3.7 | 194 |
| 1989 | 3.6 | 192 |
| 1988 | 3.5 | 192 |
| 1987 | 3.4 | 192 |
| 1986 | 3.3 | 192 |