Year	sq. km
1961	37212433.11
1962	37212433.11
1963	37212433.11
1964	37212433.11
1965	37212433.11
1966	37212433.11
1967	37212433.11
1968	37212433.11
1969	37212433.11
1970	37212433.11
1971	37212433.11
1972	37212433.11
1973	37212433.11
1974	37212433.11
1975	37212433.11
1976	37212433.11
1977	37212433.11
1978	37212433.11
1979	37212433.81
1980	37212433.81
1981	37212433.81
1982	37212433.81
1983	37212433.81
1984	37212433.81
1985	37212433.81
1986	37212433.81
1987	37212433.81
1988	37212433.81
1989	37212433.81
1990	37212433.81
1991	37212433.81
1992	37212433.81
1993	37212453.81
1994	37212463.81
1995	37212483.81
1996	37212493.81
1997	37212493.81
1998	37212493.81
1999	37212493.81
2000	37215173.81
2001	37215553.81
2002	37215923.81
2003	37216293.81
2004	37216033.81
2005	37216083.81
2006	37216413.81
2007	37216443.81
2008	37416058.81
2009	37416270.81
2010	37416640.81
2011	37416654.81
2012	37417147.81
2013	37739033.53
2014	37739067.82
2015	37739096.370000005
2016	37739937.59
2017	37739786.82
2018	37739852.879
2019	37740289.596
2020	37738493.225
2021	43493178.974