| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 72.6 | 128 |
| 2015 | 71.6 | 128 |
| 2014 | 70.7 | 125 |
| 2013 | 69.7 | 125 |
| 2012 | 68.8 | 125 |
| 2011 | 68 | 125 |
| 2010 | 67.2 | 125 |
| 2009 | 66.5 | 125 |
| 2008 | 65.9 | 125 |
| 2007 | 65.3 | 124 |
| 2006 | 64.7 | 123 |
| 2005 | 64.2 | 122 |
| 2004 | 63.7 | 120 |
| 2003 | 63.2 | 119 |
| 2002 | 62.7 | 118 |
| 2001 | 62.1 | 118 |
| 2000 | 61.6 | 118 |
| 1999 | 61 | 115 |
| 1998 | 60.3 | 114 |
| 1997 | 59.6 | 113 |
| 1996 | 58.9 | 114 |
| 1995 | 58 | 113 |
| 1994 | 57.1 | 113 |
| 1993 | 56 | 113 |
| 1992 | 54.9 | 111 |
| 1991 | 53.8 | 112 |
| 1990 | 52.8 | 110 |
| 1989 | 51.9 | 107 |
| 1988 | 51.1 | 108 |
| 1987 | 50.2 | 108 |
| 1986 | 49.4 | 107 |