Year	sq. km
1961	56224662
1962	56224662
1963	56224662
1964	56224662
1965	56224662
1966	56224662
1967	56224662
1968	56224662
1969	56224662
1970	56224662
1971	56224662
1972	56224662
1973	56224662
1974	56224662
1975	56224662
1976	56224662
1977	56224662
1978	56224662
1979	56224662
1980	56224662
1981	56224662
1982	56224662
1983	56224662
1984	56224662
1985	56224662
1986	56224662
1987	56224662
1988	56224662
1989	56224662
1990	56224662
1991	56224662
1992	56224662
1993	56224742
1994	56224742
1995	56224742
1996	56224732
1997	56224722
1998	56197532
1999	56197532
2000	56197522
2001	56197516.2
2002	56197515.2
2003	56197514.7
2004	56197534.5
2005	56197533.8
2006	56197533.4
2007	56197532.8
2008	56197532.8
2009	56194453
2010	56194455
2011	56194422
2012	56194420
2013	56193829
2014	56193825
2015	56196423
2016	56196790
2017	56199938
2018	56199884.2
2019	56297815.08
2020	56293322.129999995
2021	56293515.129999995