Year	sq. km
1961	116530
1962	119800
1963	124600
1964	126900
1965	129400
1966	132100
1967	134600
1968	137000
1969	139200
1970	142480
1971	143990
1972	152300
1973	160800
1974	168830
1975	172200
1976	175480
1977	179650
1978	183760
1979	187020
1980	189380
1981	193410
1982	197790
1983	198980
1984	200510
1985	205770
1986	207750
1987	212400
1988	213300
1989	213370
1990	213830
1991	215160
1992	213740
1993	212450
1994	213380
1995	214310
1996	215240
1997	216170
1998	217090
1999	218020
2000	218950
2001	219880
2002	220810
2003	221740
2004	222670
2005	223600
2006	224530
2007	225450
2008	226380
2009	227310
2010	228240
2011	228280
2012	228320
2013	228362.65399999998
2014	228420
2015	228460
2016	228420
2017	228470
2018	228456.965
2019	230000
2020	232718.997
2021	235000