Year	sq. km
1961	300420
1962	299420
1963	298070
1964	298780
1965	299150
1966	299510
1967	299880
1968	300240
1969	302610
1970	302970
1971	307340
1972	312700
1973	313080
1974	318430
1975	323800
1976	324160
1977	329530
1978	329890
1979	335250
1980	335620
1981	340990
1982	341360
1983	341730
1984	347170
1985	346870
1986	352030
1987	352270
1988	352500
1989	354700
1990	354550
1991	357960
1992	358310
1993	362130
1994	363510
1995	366000
1996	366840
1997	368740
1998	369820
1999	370690
2000	371430
2001	371560
2002	373110
2003	366470
2004	366170
2005	369620
2006	370985
2007	371960
2008	372815
2009	373670
2010	374525
2011	375440
2012	376405
2013	377380
2014	377488.42799999996
2015	377498.354
2016	377852.311
2017	376715.465
2018	378765.99299999996
2019	379954.219
2020	380076.74100000004
2021	381193.672