| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 20203.5 | 1 |
| 2015 | 19833.1 | 1 |
| 2014 | 19431.7 | 1 |
| 2013 | 19004.7 | 1 |
| 2012 | 18813.7 | 2 |
| 2011 | 18375.9 | 2 |
| 2010 | 18079.8 | 2 |
| 2009 | 17807.2 | 2 |
| 2008 | 17614.7 | 2 |
| 2007 | 17254.2 | 2 |
| 2006 | 17249 | 1 |
| 2005 | 17234.3 | 1 |
| 2004 | 16837.6 | 1 |
| 2003 | 17042.5 | 1 |
| 2002 | 16625.8 | 1 |
| 2001 | 16849.3 | 1 |
| 2000 | 21399 | 1 |
| 1999 | 20930.2 | 1 |
| 1998 | 20491.9 | 1 |
| 1997 | 20078.2 | 1 |
| 1996 | 19678.4 | 1 |
| 1995 | 19284.3 | 1 |
| 1994 | 18898 | 1 |
| 1993 | 18517.3 | 1 |
| 1992 | 18123 | 1 |
| 1991 | 17688.2 | 1 |
| 1990 | 17196.8 | 1 |
| 1989 | 16645.1 | 1 |
| 1988 | 16043.9 | 1 |
| 1987 | 15413.8 | 1 |
| 1986 | 14783.9 | 1 |