Year	sq. km
1961	1468.5
1962	1448.5
1963	1438.5
1964	1418.5
1965	1408.5
1966	1388.5
1967	1378.5
1968	1358.5
1969	1348.5
1970	1328.5
1971	1318.5
1972	1298.5
1973	1288.5
1974	1268.5
1975	1258.5
1976	1238.5
1977	1228.5
1978	1208.5
1979	1198.5
1980	1178.5
1981	1168.5
1982	1148.5
1983	1138.5
1984	1078.5
1985	1078.5
1986	1078.5
1987	1078.5
1988	1078.5
1989	1078.5
1990	1038.5
1991	1038.5
1992	1048.5
1993	1028.5
1994	1028.5
1995	1028.5
1996	1038.5
1997	1048.5
1998	1028.5
1999	1028.5
2000	1028.5
2001	1028.5
2002	1028.5
2003	1028.5
2004	1028.5
2005	1029.8
2006	1031.1
2007	1032.4
2008	1033.7
2009	1035
2010	1036.3
2011	1037.6
2012	1038.9
2013	1040.2
2014	1041.5
2015	1042.8
2016	1044.1
2017	1045.4
2018	1046.7
2019	1048
2020	1049.2
2021	1049.2