| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 301.7 | 38 |
| 2015 | 299.6 | 38 |
| 2014 | 298.1 | 36 |
| 2013 | 297 | 37 |
| 2012 | 296.2 | 37 |
| 2011 | 295.7 | 37 |
| 2010 | 295.3 | 37 |
| 2009 | 294.9 | 37 |
| 2008 | 294.5 | 37 |
| 2007 | 294.2 | 36 |
| 2006 | 293.8 | 36 |
| 2005 | 293.3 | 35 |
| 2004 | 292.8 | 35 |
| 2003 | 292.1 | 35 |
| 2002 | 291.1 | 34 |
| 2001 | 289.6 | 36 |
| 2000 | 287.6 | 35 |
| 1999 | 285.1 | 32 |
| 1998 | 282 | 32 |
| 1997 | 278.3 | 30 |
| 1996 | 274.2 | 31 |
| 1995 | 269.6 | 32 |
| 1994 | 264.4 | 32 |
| 1993 | 258.9 | 32 |
| 1992 | 253.1 | 33 |
| 1991 | 247.3 | 33 |
| 1990 | 241.6 | 32 |
| 1989 | 236.2 | 32 |
| 1988 | 230.9 | 33 |
| 1987 | 225.8 | 33 |
| 1986 | 220.8 | 34 |