| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 294.1 | 41 |
| 2015 | 295.9 | 39 |
| 2014 | 297.6 | 37 |
| 2013 | 299.2 | 36 |
| 2012 | 300.8 | 35 |
| 2011 | 302.2 | 35 |
| 2010 | 303.6 | 35 |
| 2009 | 304.9 | 35 |
| 2008 | 306 | 33 |
| 2007 | 306.9 | 33 |
| 2006 | 307.7 | 32 |
| 2005 | 308.2 | 32 |
| 2004 | 308.4 | 30 |
| 2003 | 308.8 | 30 |
| 2002 | 309.2 | 28 |
| 2001 | 309.7 | 28 |
| 2000 | 310.4 | 27 |
| 1999 | 310.3 | 25 |
| 1998 | 310.1 | 25 |
| 1997 | 309.6 | 23 |
| 1996 | 308.8 | 23 |
| 1995 | 308 | 23 |
| 1994 | 306.6 | 23 |
| 1993 | 304.5 | 24 |
| 1992 | 302 | 24 |
| 1991 | 299.4 | 23 |
| 1990 | 297 | 23 |
| 1989 | 294.3 | 22 |
| 1988 | 298.6 | 21 |
| 1987 | 302.9 | 21 |
| 1986 | 304.3 | 21 |