| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 62.7 | 139 |
| 2015 | 60.8 | 139 |
| 2014 | 59 | 136 |
| 2013 | 57.2 | 136 |
| 2012 | 55.4 | 136 |
| 2011 | 53.7 | 136 |
| 2010 | 52 | 136 |
| 2009 | 50.4 | 137 |
| 2008 | 48.8 | 137 |
| 2007 | 47.3 | 137 |
| 2006 | 45.9 | 138 |
| 2005 | 44.5 | 142 |
| 2004 | 43.2 | 142 |
| 2003 | 41.9 | 144 |
| 2002 | 40.8 | 144 |
| 2001 | 39.6 | 144 |
| 2000 | 38.6 | 143 |
| 1999 | 37.6 | 142 |
| 1998 | 36.6 | 142 |
| 1997 | 35.7 | 141 |
| 1996 | 34.8 | 142 |
| 1995 | 33.8 | 143 |
| 1994 | 32.8 | 144 |
| 1993 | 31.8 | 144 |
| 1992 | 30.7 | 144 |
| 1991 | 29.7 | 145 |
| 1990 | 28.7 | 142 |
| 1989 | 27.8 | 140 |
| 1988 | 27 | 140 |
| 1987 | 26.2 | 141 |
| 1986 | 25.4 | 141 |