| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 348.4 | 33 |
| 2015 | 348.8 | 33 |
| 2014 | 349.1 | 31 |
| 2013 | 349.6 | 30 |
| 2012 | 350.1 | 30 |
| 2011 | 350.7 | 30 |
| 2010 | 351.3 | 28 |
| 2009 | 351.3 | 27 |
| 2008 | 351.3 | 27 |
| 2007 | 351.2 | 24 |
| 2006 | 350.8 | 24 |
| 2005 | 350.5 | 24 |
| 2004 | 350.5 | 24 |
| 2003 | 350.4 | 24 |
| 2002 | 349.6 | 22 |
| 2001 | 348.8 | 22 |
| 2000 | 348 | 22 |
| 1999 | 347.4 | 22 |
| 1998 | 346.8 | 21 |
| 1997 | 345.8 | 20 |
| 1996 | 345 | 20 |
| 1995 | 344 | 20 |
| 1994 | 342.7 | 20 |
| 1993 | 341.6 | 20 |
| 1992 | 340.7 | 20 |
| 1991 | 339.9 | 20 |
| 1990 | 338.8 | 19 |
| 1989 | 337.7 | 19 |
| 1988 | 336.3 | 19 |
| 1987 | 334.9 | 20 |
| 1986 | 333.1 | 20 |