Year	sq. km
1961	1463240
1962	1462551
1963	1459971
1964	1453675
1965	1449838
1966	1446722
1967	1445734
1968	1437860
1969	1438778
1970	1424346
1971	1404520
1972	1399699
1973	1394365
1974	1391006
1975	1386742
1976	1379022
1977	1377709
1978	1378018
1979	1373699
1980	1368042
1981	1366566
1982	1365420
1983	1355046
1984	1352532
1985	1350151
1986	1347043
1987	1345157
1988	1337388
1989	1336303
1990	1330137
1991	1309041
1992	1303834
1993	1300999
1994	1296803
1995	1280778
1996	1282212
1997	1275853.4
1998	1275578.8
1999	1274348.2
2000	1268958.4000000001
2001	1253287.2
2002	1245290.2
2003	1234585.1
2004	1228778.1
2005	1231117.9
2006	1216685.6
2007	1205833.2
2008	1212579.2000000002
2009	1203568.2
2010	1198599
2011	1186786.7000000002
2012	1182911.2
2013	1178109.5000000002
2014	1162669.2
2015	1160697
2016	1154235.2200000002
2017	1154004.506
2018	1148370.967
2019	1157429.601
2020	1148541.1570000001
2021	1146123.0010000002