| 时间 | 值 （人/平方公里） | 世界排名 |
|---|---|---|
| 2016 | 395 | 27 |
| 2015 | 387.3 | 29 |
| 2014 | 379.7 | 27 |
| 2013 | 372.4 | 27 |
| 2012 | 365.5 | 27 |
| 2011 | 358.9 | 27 |
| 2010 | 352.3 | 27 |
| 2009 | 345.9 | 29 |
| 2008 | 337.7 | 29 |
| 2007 | 331.8 | 29 |
| 2006 | 326 | 29 |
| 2005 | 320.2 | 29 |
| 2004 | 314.6 | 29 |
| 2003 | 309.1 | 29 |
| 2002 | 303.6 | 30 |
| 2001 | 297.6 | 32 |
| 2000 | 290.6 | 33 |
| 1999 | 283 | 35 |
| 1998 | 275.9 | 37 |
| 1997 | 269.7 | 35 |
| 1996 | 263 | 34 |
| 1995 | 256.2 | 34 |
| 1994 | 249.5 | 34 |
| 1993 | 243.1 | 35 |
| 1992 | 236.7 | 37 |
| 1991 | 228.7 | 39 |
| 1990 | 215.3 | 40 |
| 1989 | 208.8 | 39 |
| 1988 | 205.3 | 39 |
| 1987 | 201.9 | 39 |
| 1986 | 198.7 | 38 |