| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 346.5 | 34 |
| 2015 | 341.1 | 34 |
| 2014 | 335.7 | 32 |
| 2013 | 330.3 | 32 |
| 2012 | 324.9 | 33 |
| 2011 | 319.5 | 33 |
| 2010 | 314.3 | 33 |
| 2009 | 309.3 | 33 |
| 2008 | 304.4 | 35 |
| 2007 | 299.5 | 35 |
| 2006 | 294.5 | 35 |
| 2005 | 289.3 | 37 |
| 2004 | 284 | 38 |
| 2003 | 278.5 | 38 |
| 2002 | 272.8 | 39 |
| 2001 | 267.2 | 39 |
| 2000 | 261.6 | 39 |
| 1999 | 256 | 38 |
| 1998 | 250.5 | 39 |
| 1997 | 245 | 39 |
| 1996 | 239.6 | 40 |
| 1995 | 234.2 | 41 |
| 1994 | 228.9 | 42 |
| 1993 | 223.5 | 43 |
| 1992 | 218.2 | 43 |
| 1991 | 213 | 43 |
| 1990 | 207.8 | 42 |
| 1989 | 202.5 | 41 |
| 1988 | 197.4 | 41 |
| 1987 | 192.2 | 42 |
| 1986 | 187.2 | 42 |