| 时间 | 值 （平方公里） | 世界排名 |
|---|---|---|
| 2016 | 238390 | 82 |
| 2015 | 238390 | 82 |
| 2014 | 238390 | 82 |
| 2013 | 238390 | 82 |
| 2012 | 238390 | 82 |
| 2011 | 238390 | 82 |
| 2010 | 238390 | 81 |
| 2009 | 238390 | 81 |
| 2008 | 238390 | 81 |
| 2007 | 238390 | 81 |
| 2006 | 238390 | 81 |
| 2005 | 238390 | 81 |
| 2004 | 238390 | 81 |
| 2003 | 238390 | 81 |
| 2002 | 238390 | 81 |
| 2001 | 238390 | 81 |
| 2000 | 238390 | 81 |
| 1999 | 238390 | 81 |
| 1998 | 238390 | 81 |
| 1997 | 238390 | 81 |
| 1996 | 238390 | 81 |
| 1995 | 238390 | 81 |
| 1994 | 238390 | 81 |
| 1993 | 238390 | 81 |
| 1992 | 238390 | 81 |
| 1991 | 238390 | 81 |
| 1990 | 238390 | 81 |
| 1989 | 238390 | 81 |
| 1988 | 238390 | 81 |
| 1987 | 238390 | 81 |
| 1986 | 238390 | 81 |