| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 221.3 | 55 |
| 2015 | 213.7 | 56 |
| 2014 | 204.5 | 58 |
| 2013 | 193.8 | 61 |
| 2012 | 181.7 | 62 |
| 2011 | 168.1 | 65 |
| 2010 | 153.3 | 66 |
| 2009 | 137 | 70 |
| 2008 | 119.7 | 79 |
| 2007 | 102.5 | 90 |
| 2006 | 87 | 97 |
| 2005 | 74.5 | 108 |
| 2004 | 65.4 | 117 |
| 2003 | 59.3 | 125 |
| 2002 | 55.6 | 127 |
| 2001 | 53.1 | 129 |
| 2000 | 51 | 131 |
| 1999 | 49 | 131 |
| 1998 | 47.4 | 131 |
| 1997 | 46 | 129 |
| 1996 | 45 | 130 |
| 1995 | 44.2 | 130 |
| 1994 | 43.7 | 129 |
| 1993 | 43.2 | 127 |
| 1992 | 42.7 | 126 |
| 1991 | 42 | 128 |
| 1990 | 41 | 125 |
| 1989 | 39.8 | 122 |
| 1988 | 38.2 | 124 |
| 1987 | 36.4 | 126 |
| 1986 | 34.3 | 127 |