| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 139.8 | 77 |
| 2015 | 136.4 | 78 |
| 2014 | 132.9 | 77 |
| 2013 | 129.5 | 77 |
| 2012 | 126.1 | 78 |
| 2011 | 122.8 | 80 |
| 2010 | 119.6 | 81 |
| 2009 | 116.4 | 82 |
| 2008 | 113.3 | 83 |
| 2007 | 110.3 | 84 |
| 2006 | 107.3 | 85 |
| 2005 | 104.5 | 87 |
| 2004 | 101.8 | 87 |
| 2003 | 99.1 | 88 |
| 2002 | 96.6 | 90 |
| 2001 | 94 | 91 |
| 2000 | 91.4 | 92 |
| 1999 | 88.7 | 90 |
| 1998 | 86 | 92 |
| 1997 | 83.4 | 91 |
| 1996 | 80.9 | 92 |
| 1995 | 78.6 | 95 |
| 1994 | 76.6 | 96 |
| 1993 | 74.7 | 97 |
| 1992 | 73.1 | 97 |
| 1991 | 71.4 | 98 |
| 1990 | 69.6 | 97 |
| 1989 | 67.8 | 95 |
| 1988 | 65.9 | 95 |
| 1987 | 63.9 | 95 |
| 1986 | 61.8 | 95 |