Year	sq. km
1961	13566391.065000001
1962	13555816.935
1963	13557058.401999999
1964	13557243.716
1965	13566745.530000001
1966	13568783.877
1967	13589278.259
1968	13824667.231
1969	13789425.809
1970	13582363.605
1971	13610819.287
1972	13602022.620000001
1973	13567269.120000001
1974	13580700.620000001
1975	13574883.620000001
1976	13588878.937
1977	13489327.453000002
1978	13509723.870000001
1979	13469690.574000001
1980	13483417.269000001
1981	13478779.002
1982	13452946.931
1983	13371184.003000002
1984	13445589.182000002
1985	13493409.811
1986	13356804.890000002
1987	13383827.578000002
1988	13440275.328
1989	13435983.219000002
1990	13451404.923
1991	13412544.064
1992	13415639.960000003
1993	13387735.560999999
1994	13521282.069
1995	13503139.791000001
1996	13546224.770000001
1997	13562701.574999997
1998	13653080.524000002
1999	13606719.819999998
2000	13608896.985999998
2001	13593831.730000002
2002	13476185.891
2003	13378217.145999998
2004	12923412.482000003
2005	13070709.220999999
2006	13035469.376999998
2007	12895715.676
2008	12782925.703000002
2009	12689466.472999997
2010	12559546.877
2011	12717008.916
2012	12589387.983
2013	12435795.040999997
2014	12451996.958
2015	12184108.645
2016	12119940.781
2017	12412567.437999997
2018	12270962.288
2019	12313592.118999999
2020	12213479.474
2021	12281992.245