| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 236.9 | 50 |
| 2015 | 234.1 | 50 |
| 2014 | 232.1 | 48 |
| 2013 | 231.2 | 48 |
| 2012 | 230.8 | 48 |
| 2011 | 230.3 | 47 |
| 2010 | 234.6 | 46 |
| 2009 | 234.9 | 46 |
| 2008 | 235.5 | 46 |
| 2007 | 235.9 | 46 |
| 2006 | 236.2 | 46 |
| 2005 | 236.5 | 46 |
| 2004 | 236.6 | 46 |
| 2003 | 236.6 | 46 |
| 2002 | 236.5 | 46 |
| 2001 | 236 | 46 |
| 2000 | 235.6 | 46 |
| 1999 | 235.3 | 45 |
| 1998 | 235.1 | 44 |
| 1997 | 235 | 43 |
| 1996 | 234.7 | 43 |
| 1995 | 234 | 42 |
| 1994 | 233.3 | 40 |
| 1993 | 232.5 | 40 |
| 1992 | 230.9 | 40 |
| 1991 | 229.2 | 38 |
| 1990 | 227.5 | 36 |
| 1989 | 225.6 | 35 |
| 1988 | 223.8 | 34 |
| 1987 | 223 | 34 |
| 1986 | 222.6 | 33 |