| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 1391.6 | 7 |
| 2015 | 1363.9 | 7 |
| 2014 | 1336.7 | 6 |
| 2013 | 1310 | 7 |
| 2012 | 1283.3 | 8 |
| 2011 | 1256.7 | 8 |
| 2010 | 1223.3 | 8 |
| 2009 | 1200 | 8 |
| 2008 | 1206.7 | 8 |
| 2007 | 1163.3 | 8 |
| 2006 | 1110 | 10 |
| 2005 | 1070 | 10 |
| 2004 | 1040 | 9 |
| 2003 | 1013.3 | 9 |
| 2002 | 990 | 9 |
| 2001 | 973.3 | 9 |
| 2000 | 953.3 | 8 |
| 1999 | 933.3 | 8 |
| 1998 | 903.3 | 9 |
| 1997 | 880 | 8 |
| 1996 | 873.3 | 8 |
| 1995 | 850 | 8 |
| 1994 | 816.7 | 8 |
| 1993 | 806.7 | 8 |
| 1992 | 780 | 8 |
| 1991 | 756.7 | 8 |
| 1990 | 726.7 | 9 |
| 1989 | 722 | 9 |
| 1988 | 699.6 | 9 |
| 1987 | 677.1 | 9 |
| 1986 | 654.5 | 9 |