| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 41.7 | 157 |
| 2015 | 40.8 | 157 |
| 2014 | 39.8 | 154 |
| 2013 | 38.9 | 153 |
| 2012 | 38 | 153 |
| 2011 | 37.2 | 155 |
| 2010 | 36.4 | 154 |
| 2009 | 35.7 | 154 |
| 2008 | 35 | 154 |
| 2007 | 34.5 | 156 |
| 2006 | 33.9 | 156 |
| 2005 | 33.4 | 156 |
| 2004 | 33 | 155 |
| 2003 | 32.7 | 155 |
| 2002 | 32.3 | 155 |
| 2001 | 32 | 155 |
| 2000 | 31.6 | 154 |
| 1999 | 31.2 | 152 |
| 1998 | 30.7 | 151 |
| 1997 | 30.3 | 150 |
| 1996 | 29.8 | 150 |
| 1995 | 29.3 | 149 |
| 1994 | 28.7 | 147 |
| 1993 | 28.2 | 148 |
| 1992 | 27.6 | 146 |
| 1991 | 27 | 147 |
| 1990 | 26.3 | 144 |
| 1989 | 25.6 | 142 |
| 1988 | 24.8 | 142 |
| 1987 | 24 | 143 |
| 1986 | 23.2 | 143 |