| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 106.5 | 93 |
| 2015 | 103.2 | 95 |
| 2014 | 99.2 | 96 |
| 2013 | 94.8 | 99 |
| 2012 | 90 | 101 |
| 2011 | 85.3 | 105 |
| 2010 | 80.9 | 109 |
| 2009 | 76.8 | 111 |
| 2008 | 73.5 | 112 |
| 2007 | 70.2 | 117 |
| 2006 | 67.3 | 119 |
| 2005 | 64.8 | 120 |
| 2004 | 62.7 | 123 |
| 2003 | 61.2 | 122 |
| 2002 | 59.9 | 122 |
| 2001 | 58.9 | 122 |
| 2000 | 57.8 | 123 |
| 1999 | 56.8 | 120 |
| 1998 | 55.8 | 121 |
| 1997 | 54.8 | 120 |
| 1996 | 53.4 | 120 |
| 1995 | 51.8 | 121 |
| 1994 | 49.8 | 121 |
| 1993 | 47.5 | 122 |
| 1992 | 45 | 124 |
| 1991 | 42.5 | 126 |
| 1990 | 40.4 | 126 |
| 1989 | 38.5 | 126 |
| 1988 | 36.9 | 127 |
| 1987 | 35.4 | 128 |
| 1986 | 34.1 | 128 |