Year	sq. km
1961	14059937.445
1962	14059514.315000001
1963	14072868.782
1964	14077547.096
1965	14097265.91
1966	14101484.257
1967	14119997.638999999
1968	14357906.611000001
1969	14333552.189
1970	14123539.985
1971	14166835.667
1972	14165105
1973	14134426.5
1974	14144966
1975	14137092
1976	14151383.9
1977	14056334
1978	14083363
1979	14051211.287
1980	14065040.566
1981	14062271.882
1982	14024041.394000001
1983	13963034.05
1984	13995596.561999999
1985	13998218.524
1986	13815067.936999999
1987	13809622.958
1988	13815716.041000001
1989	13777848.265999999
1990	13745787.303
1991	13716522.616999999
1992	13717702.327
1993	13620411.921
1994	13685554.421999998
1995	13586628.218
1996	13567106.42
1997	13513430.218
1998	13534468.241
1999	13421558.53
2000	13422839.689000001
2001	13383906.067000002
2002	13266331.101
2003	13166391.989
2004	12728843.559
2005	12876957.431000002
2006	12834277.287
2007	12694487.886
2008	12545428.313000001
2009	12444110.973
2010	12304436.227
2011	12442865.986000001
2012	12323907.713
2013	12177665.211000001
2014	12184858.678
2015	11914933.665
2016	11850536.281
2017	12115326.138
2018	11973544.429000001
2019	12010389.634000001
2020	11926447.188
2021	11984861.809