Year	sq. km
1961	22843557.7
1962	22914879.8
1963	22974718
1964	23037208.5
1965	23114901.7
1966	23195977.6
1967	23269312.1
1968	23358677.3
1969	23440022.7
1970	23535532.400000002
1971	23659459.1
1972	23786869.6
1973	23904999.427
1974	24032526.455000002
1975	24125334.382000003
1976	24104953.742
1977	24245259.503000002
1978	24377856.664
1979	24495732.991
1980	24584310.198000003
1981	24634501.245
1982	24758387.873
1983	24919717.599999998
1984	25088169.827000003
1985	25272660.825
1986	25358703.482
1987	25465483.709000003
1988	25538270.936
1989	25615301.164
1990	25708619.091000002
1991	25763460.818000004
1992	25770784.285
1993	25750184.133
1994	25777141.78
1995	25709074.799999997
1996	25701089.02
1997	25837890.04
1998	25858143.46
1999	25883107.679999996
2000	25893548.099999998
2001	25874472.434
2002	25884739.769
2003	25729101.403
2004	25754370.338
2005	25587983.472
2006	25593264.319
2007	25598224.941
2008	25532233.116
2009	25518473.762
2010	25587433.453
2011	25572344.68
2012	25567753.072999995
2013	25573334.378999997
2014	25522088.177999996
2015	25536828.945
2016	25520889.495
2017	25509590.343
2018	25491465.083
2019	25469095.348000005
2020	25493347.401000004
2021	25494462.671