Year	sq. km
1961	2005230
1962	2004340
1963	2006980
1964	2007700
1965	2010360
1966	2010270
1967	2016770
1968	2020000
1969	2026940
1970	2034420
1971	2055840
1972	2076180
1973	2081000
1974	2082080
1975	2072530
1976	2075430
1977	2074270
1978	2071000
1979	2082480
1980	2070520
1981	2033576
1982	2041553.4
1983	2048687.4
1984	2055863.6
1985	2059348
1986	2059778
1987	2065950
1988	2074350
1989	2070168
1990	2071082
1991	2090129
1992	2108264.8
1993	2119616.8
1994	2124781.6
1995	2125516
1996	2129910.6
1997	2120435.2
1998	2129962.2
1999	2117061
2000	2109946
2001	2116986
2002	2122666
2003	2130214
2004	2138940
2005	1971217
2006	1975960
2007	1980196
2008	1957254
2009	1955318
2010	1960133
2011	1962008
2012	1964161.9
2013	1967027.55
2014	1963620.9
2015	1964739.771
2016	1970262.514
2017	1978307.0880000002
2018	1978079.9479999999
2019	1970318.4530000002
2020	1979378.137
2021	1979511.47