| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 54.3 | 140 |
| 2015 | 53.4 | 140 |
| 2014 | 52.5 | 137 |
| 2013 | 51.6 | 137 |
| 2012 | 50.8 | 137 |
| 2011 | 49.9 | 137 |
| 2010 | 49 | 138 |
| 2009 | 48.1 | 138 |
| 2008 | 47.3 | 138 |
| 2007 | 46.5 | 139 |
| 2006 | 45.6 | 140 |
| 2005 | 44.8 | 140 |
| 2004 | 44 | 141 |
| 2003 | 43.2 | 141 |
| 2002 | 42.4 | 141 |
| 2001 | 41.6 | 141 |
| 2000 | 40.8 | 141 |
| 1999 | 40 | 139 |
| 1998 | 39.2 | 140 |
| 1997 | 38.4 | 140 |
| 1996 | 37.6 | 140 |
| 1995 | 36.9 | 140 |
| 1994 | 36.1 | 138 |
| 1993 | 35.4 | 138 |
| 1992 | 34.7 | 138 |
| 1991 | 33.9 | 140 |
| 1990 | 33.2 | 138 |
| 1989 | 32.5 | 136 |
| 1988 | 31.9 | 136 |
| 1987 | 31.2 | 136 |
| 1986 | 30.5 | 135 |