Year	sq. km
1961	861700
1962	861900
1963	862120
1964	862410
1965	862620
1966	862840
1967	863040
1968	863400
1969	863750
1970	864200
1971	864670
1972	865170
1973	865700
1974	866400
1975	866840
1976	867500
1977	868040
1978	868560
1979	869090
1980	869620
1981	870130
1982	870680
1983	872700
1984	924230
1985	976250
1986	1027800
1987	1079800
1988	1131300
1989	1182900
1990	1234810
1991	1236720
1992	1237460
1993	1307850
1994	1377850
1995	1447850
1996	1517850
1997	1587850
1998	1667850
1999	1737850
2000	1737850
2001	1737910
2002	1737930
2003	1737980
2004	1737090
2005	1737170
2006	1736740
2007	1736750
2008	1735720
2009	1734350
2010	1734060
2011	1733880
2012	1733450
2013	1732950
2014	1735753
2015	1736370
2016	1736270
2017	1735961
2018	1735955
2019	1736164.35
2020	1736373.7
2021	1736370