Year	sq. km
1961	12477707.445
1962	12468227.315000001
1963	12471019.782
1964	12477711.096
1965	12485147.91
1966	12484657.257
1967	12506231.638999999
1968	12740297.611000001
1969	12707272.189
1970	12503646.985
1971	12530115.667
1972	12525151
1973	12490816.5
1974	12499158
1975	12492577
1976	12504563.9
1977	12406766
1978	12428130
1979	12389229.287
1980	12404655.566
1981	12402380.882
1982	12379649.394000001
1983	12297719.05
1984	12319592.562
1985	12316757.524
1986	12131818.936999999
1987	12112382.958
1988	12118381.041000001
1989	12067141.265999999
1990	12032847.303
1991	11994180.436999999
1992	11999062.327000001
1993	11901830.921
1994	11967340.421999998
1995	11889273.218
1996	11863950.420000002
1997	11812255.818
1998	11815155.441
1999	11698387.33
2000	11695250.089
2001	11687868.067000002
2002	11573851.101
2003	11482326.989
2004	11031376.559
2005	11180594.031
2006	11147684.787
2007	11017631.886
2008	10903400.572999999
2009	10813732.282999998
2010	10697737.707
2011	10856652.625999998
2012	10741058.313000001
2013	10590344.760999998
2014	10604915.188
2015	10339992.645
2016	10284170.011
2017	10581015.328
2018	10439964.679
2019	10482565.153999997
2020	10391616.478
2021	10466856.911