| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 62.9 | 138 |
| 2015 | 61.6 | 138 |
| 2014 | 60.3 | 135 |
| 2013 | 58.4 | 135 |
| 2012 | 57.1 | 135 |
| 2011 | 55.8 | 135 |
| 2010 | 54.6 | 135 |
| 2009 | 53.4 | 135 |
| 2008 | 52.2 | 135 |
| 2007 | 51.1 | 136 |
| 2006 | 50 | 136 |
| 2005 | 49 | 136 |
| 2004 | 48 | 136 |
| 2003 | 47 | 134 |
| 2002 | 46.1 | 134 |
| 2001 | 45.2 | 134 |
| 2000 | 44.4 | 135 |
| 1999 | 43.7 | 134 |
| 1998 | 43 | 134 |
| 1997 | 42.4 | 133 |
| 1996 | 41.8 | 133 |
| 1995 | 41.2 | 133 |
| 1994 | 40.6 | 131 |
| 1993 | 40 | 132 |
| 1992 | 39.3 | 132 |
| 1991 | 38.6 | 133 |
| 1990 | 37.8 | 131 |
| 1989 | 36.8 | 130 |
| 1988 | 35.7 | 130 |
| 1987 | 34.6 | 130 |
| 1986 | 33.5 | 130 |