| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 102.4 | 100 |
| 2015 | 99.9 | 101 |
| 2014 | 97.4 | 98 |
| 2013 | 94.9 | 98 |
| 2012 | 92.4 | 99 |
| 2011 | 90 | 100 |
| 2010 | 87.7 | 101 |
| 2009 | 85.4 | 102 |
| 2008 | 83.2 | 102 |
| 2007 | 81 | 104 |
| 2006 | 78.9 | 106 |
| 2005 | 76.7 | 106 |
| 2004 | 74.6 | 106 |
| 2003 | 72.5 | 109 |
| 2002 | 70.5 | 110 |
| 2001 | 68.5 | 110 |
| 2000 | 66.5 | 110 |
| 1999 | 64.6 | 108 |
| 1998 | 62.8 | 109 |
| 1997 | 61 | 109 |
| 1996 | 59.2 | 112 |
| 1995 | 57.3 | 115 |
| 1994 | 55.4 | 114 |
| 1993 | 53.5 | 115 |
| 1992 | 46.9 | 120 |
| 1991 | 45.3 | 122 |
| 1990 | 43.7 | 122 |
| 1989 | 42.2 | 121 |
| 1988 | 40.8 | 121 |
| 1987 | 39.5 | 121 |
| 1986 | 38.3 | 122 |