| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 235.4 | 51 |
| 2015 | 233.8 | 51 |
| 2014 | 232 | 49 |
| 2013 | 230.2 | 49 |
| 2012 | 228.4 | 49 |
| 2011 | 226.7 | 48 |
| 2010 | 225 | 48 |
| 2009 | 223.5 | 48 |
| 2008 | 222.1 | 47 |
| 2007 | 220.8 | 47 |
| 2006 | 219.3 | 47 |
| 2005 | 217.8 | 47 |
| 2004 | 216.2 | 47 |
| 2003 | 214.5 | 47 |
| 2002 | 212.6 | 47 |
| 2001 | 210.4 | 47 |
| 2000 | 208 | 47 |
| 1999 | 205.3 | 46 |
| 1998 | 202.2 | 46 |
| 1997 | 199 | 45 |
| 1996 | 195.8 | 45 |
| 1995 | 192.7 | 46 |
| 1994 | 189.8 | 46 |
| 1993 | 187 | 46 |
| 1992 | 184.4 | 46 |
| 1991 | 181.9 | 46 |
| 1990 | 179.7 | 45 |
| 1989 | 177.5 | 44 |
| 1988 | 175.6 | 44 |
| 1987 | 173.8 | 44 |
| 1986 | 172 | 44 |