| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 19249.5 | 2 |
| 2015 | 19153.5 | 2 |
| 2014 | 19066 | 2 |
| 2013 | 18985.5 | 2 |
| 2012 | 18891.5 | 1 |
| 2011 | 18748.5 | 1 |
| 2010 | 18547 | 1 |
| 2009 | 18267 | 1 |
| 2008 | 17926.5 | 1 |
| 2007 | 17555.5 | 1 |
| 2006 | 17204 | 2 |
| 2005 | 16896.5 | 2 |
| 2004 | 16657 | 2 |
| 2003 | 16466.5 | 2 |
| 2002 | 16314.5 | 2 |
| 2001 | 16180 | 2 |
| 2000 | 16041 | 2 |
| 1999 | 15900 | 2 |
| 1998 | 15761.5 | 2 |
| 1997 | 15625.5 | 2 |
| 1996 | 15483.5 | 2 |
| 1995 | 15345.5 | 2 |
| 1994 | 15213.5 | 2 |
| 1993 | 15069 | 2 |
| 1992 | 14931.5 | 2 |
| 1991 | 14812 | 2 |
| 1990 | 14719.5 | 2 |
| 1989 | 14656 | 2 |
| 1988 | 14617.5 | 2 |
| 1987 | 14586 | 2 |
| 1986 | 14520.5 | 2 |