| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 229.5 | 52 |
| 2015 | 227.1 | 52 |
| 2014 | 224.7 | 50 |
| 2013 | 222.3 | 50 |
| 2012 | 219.9 | 50 |
| 2011 | 217.5 | 50 |
| 2010 | 215.1 | 50 |
| 2009 | 212.7 | 50 |
| 2008 | 210.2 | 50 |
| 2007 | 207.7 | 50 |
| 2006 | 205.2 | 49 |
| 2005 | 202.8 | 48 |
| 2004 | 200.6 | 48 |
| 2003 | 198.4 | 48 |
| 2002 | 196.1 | 48 |
| 2001 | 193.3 | 49 |
| 2000 | 190 | 50 |
| 1999 | 186 | 49 |
| 1998 | 181.5 | 49 |
| 1997 | 176.7 | 49 |
| 1996 | 171.9 | 49 |
| 1995 | 167.3 | 49 |
| 1994 | 163 | 49 |
| 1993 | 159 | 50 |
| 1992 | 155.5 | 50 |
| 1991 | 153 | 51 |
| 1990 | 151.6 | 49 |
| 1989 | 151.4 | 48 |
| 1988 | 152.4 | 48 |
| 1987 | 154.2 | 48 |
| 1986 | 156.4 | 48 |