| 时间 | 值 （平方公里） | 世界排名 |
|---|---|---|
| 2016 | 637660 | 42 |
| 2015 | 637660 | 42 |
| 2014 | 637660 | 42 |
| 2013 | 637660 | 42 |
| 2012 | 637660 | 42 |
| 2011 | 637660 | 42 |
| 2010 | 637660 | 41 |
| 2009 | 637660 | 41 |
| 2008 | 637660 | 41 |
| 2007 | 637660 | 41 |
| 2006 | 637660 | 41 |
| 2005 | 637660 | 41 |
| 2004 | 637660 | 41 |
| 2003 | 637660 | 41 |
| 2002 | 637660 | 41 |
| 2001 | 637660 | 41 |
| 2000 | 637660 | 41 |
| 1999 | 637660 | 41 |
| 1998 | 637660 | 41 |
| 1997 | 637660 | 41 |
| 1996 | 637660 | 41 |
| 1995 | 637660 | 41 |
| 1994 | 637660 | 41 |
| 1993 | 637660 | 41 |
| 1992 | 637660 | 41 |
| 1991 | 637660 | 41 |
| 1990 | 637660 | 41 |
| 1989 | 637660 | 41 |
| 1988 | 637660 | 41 |
| 1987 | 637660 | 41 |
| 1986 | 637660 | 41 |