Year	sq. km
1961	156800
1962	158800
1963	158800
1964	159800
1965	160800
1966	160800
1967	161500
1968	161500
1969	162000
1970	162000
1971	163000
1972	163100
1973	164400
1974	166250
1975	167150
1976	168400
1977	170800
1978	172100
1979	172250
1980	172550
1981	173700
1982	174900
1983	175840
1984	179010
1985	181800
1986	182800
1987	184000
1988	187200
1989	188200
1990	189300
1991	189500
1992	192000
1993	195020
1994	197000
1995	198000
1996	198000
1997	197000
1998	197000
1999	196000
2000	196000
2001	196000
2002	196000
2003	196000
2004	200000
2005	202000
2006	203000
2007	206000
2008	206000
2009	206000
2010	206000
2011	206000
2012	207000
2013	212000
2014	213500
2015	222000
2016	219000
2017	220000
2018	231500
2019	232300
2020	233000
2021	235000