| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 1251.8 | 10 |
| 2015 | 1238.4 | 10 |
| 2014 | 1224.6 | 9 |
| 2013 | 1210.5 | 9 |
| 2012 | 1196.3 | 9 |
| 2011 | 1182.4 | 9 |
| 2010 | 1168.8 | 9 |
| 2009 | 1155.8 | 9 |
| 2008 | 1143.2 | 10 |
| 2007 | 1130.4 | 10 |
| 2006 | 1116.8 | 9 |
| 2005 | 1101.9 | 8 |
| 2004 | 1085.6 | 8 |
| 2003 | 1068 | 8 |
| 2002 | 1049.4 | 7 |
| 2001 | 1030.2 | 7 |
| 2000 | 1010.8 | 7 |
| 1999 | 991.2 | 7 |
| 1998 | 971.4 | 7 |
| 1997 | 951.5 | 7 |
| 1996 | 931.6 | 7 |
| 1995 | 911.9 | 7 |
| 1994 | 892.5 | 7 |
| 1993 | 873.4 | 7 |
| 1992 | 854.4 | 7 |
| 1991 | 835.3 | 7 |
| 1990 | 815.8 | 7 |
| 1989 | 795.9 | 7 |
| 1988 | 775.7 | 7 |
| 1987 | 755.5 | 7 |
| 1986 | 735.5 | 7 |