| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 110.9 | 90 |
| 2015 | 109.5 | 91 |
| 2014 | 108.5 | 89 |
| 2013 | 107.7 | 90 |
| 2012 | 106.5 | 90 |
| 2011 | 103.7 | 91 |
| 2010 | 98.9 | 94 |
| 2009 | 91.7 | 97 |
| 2008 | 82.5 | 104 |
| 2007 | 72.3 | 112 |
| 2006 | 62.7 | 126 |
| 2005 | 54.8 | 132 |
| 2004 | 48.9 | 133 |
| 2003 | 44.8 | 138 |
| 2002 | 42 | 142 |
| 2001 | 39.8 | 143 |
| 2000 | 37.7 | 145 |
| 1999 | 35.7 | 145 |
| 1998 | 33.9 | 146 |
| 1997 | 32.3 | 147 |
| 1996 | 30.8 | 148 |
| 1995 | 29.3 | 148 |
| 1994 | 27.9 | 149 |
| 1993 | 26.4 | 153 |
| 1992 | 25 | 152 |
| 1991 | 23.6 | 153 |
| 1990 | 22.3 | 152 |
| 1989 | 21 | 151 |
| 1988 | 19.8 | 152 |
| 1987 | 18.7 | 152 |
| 1986 | 17.6 | 154 |