| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 18237104 | 8 |
| 2015 | 17598228 | 8 |
| 2014 | 16982363 | 8 |
| 2013 | 16389029 | 8 |
| 2012 | 15816426 | 8 |
| 2011 | 15263828 | 8 |
| 2010 | 14730537 | 8 |
| 2009 | 14215877 | 8 |
| 2008 | 13719871 | 9 |
| 2007 | 13239874 | 9 |
| 2006 | 12777296 | 9 |
| 2005 | 12330879 | 9 |
| 2004 | 11900642 | 9 |
| 2003 | 11484292 | 9 |
| 2002 | 11083051 | 9 |
| 2001 | 10695828 | 9 |
| 2000 | 10284947 | 9 |
| 1999 | 9860440 | 10 |
| 1998 | 9454003 | 13 |
| 1997 | 9064318 | 13 |
| 1996 | 8691200 | 14 |
| 1995 | 8332474 | 14 |
| 1994 | 7989018 | 16 |
| 1993 | 7659719 | 16 |
| 1992 | 7344419 | 16 |
| 1991 | 7041281 | 16 |
| 1990 | 6620697 | 16 |
| 1989 | 6171735 | 18 |
| 1988 | 5753775 | 18 |
| 1987 | 5363083 | 21 |
| 1986 | 4999402 | 21 |