| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 266.1 | 46 |
| 2015 | 265.1 | 47 |
| 2014 | 264 | 45 |
| 2013 | 262.8 | 45 |
| 2012 | 261.5 | 45 |
| 2011 | 260.2 | 45 |
| 2010 | 258.9 | 45 |
| 2009 | 257.6 | 44 |
| 2008 | 256.4 | 44 |
| 2007 | 255.2 | 44 |
| 2006 | 254 | 44 |
| 2005 | 252.8 | 44 |
| 2004 | 251.6 | 44 |
| 2003 | 250.3 | 44 |
| 2002 | 249.1 | 43 |
| 2001 | 248 | 43 |
| 2000 | 247.2 | 43 |
| 1999 | 246.5 | 40 |
| 1998 | 246.1 | 40 |
| 1997 | 245.7 | 38 |
| 1996 | 245.3 | 37 |
| 1995 | 244.6 | 36 |
| 1994 | 243.7 | 36 |
| 1993 | 242.6 | 36 |
| 1992 | 241.2 | 35 |
| 1991 | 239.7 | 35 |
| 1990 | 238.2 | 33 |
| 1989 | 236.6 | 31 |
| 1988 | 234.9 | 32 |
| 1987 | 233 | 32 |
| 1986 | 230.8 | 32 |