| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 66 | 133 |
| 2015 | 65 | 135 |
| 2014 | 64 | 132 |
| 2013 | 63.1 | 131 |
| 2012 | 62.1 | 132 |
| 2011 | 61.1 | 132 |
| 2010 | 60.1 | 132 |
| 2009 | 59.2 | 132 |
| 2008 | 58.2 | 132 |
| 2007 | 57.2 | 132 |
| 2006 | 56.2 | 132 |
| 2005 | 55.3 | 131 |
| 2004 | 54.4 | 131 |
| 2003 | 53.5 | 132 |
| 2002 | 52.6 | 132 |
| 2001 | 51.8 | 132 |
| 2000 | 50.8 | 132 |
| 1999 | 49.9 | 129 |
| 1998 | 49 | 129 |
| 1997 | 43.1 | 132 |
| 1996 | 42.2 | 132 |
| 1995 | 41.3 | 132 |
| 1994 | 40.4 | 133 |
| 1993 | 39.6 | 133 |
| 1992 | 38.7 | 133 |
| 1991 | 37.8 | 134 |
| 1990 | 36.9 | 133 |
| 1989 | 36 | 131 |
| 1988 | 35.2 | 131 |
| 1987 | 34.3 | 131 |
| 1986 | 33.5 | 129 |