Year	sq. km
1961	1749520
1962	1764820
1963	1761540
1964	1767120
1965	1771770
1966	1775300
1967	1778070
1968	1783640
1969	1777920
1970	1780520
1971	1778170
1972	1779460
1973	1787510
1974	1792820
1975	1796940
1976	1796490
1977	1795910
1978	1805920
1979	1805800
1980	1802720
1981	1804010
1982	1807710
1983	1804620
1984	1814520
1985	1813400
1986	1811920
1987	1815430
1988	1810910
1989	1815010
1990	1814130
1991	1815860
1992	1813050
1993	1813820
1994	1812910
1995	1809450
1996	1805890
1997	1809810
1998	1808740
1999	1810210
2000	1809750
2001	1804870
2002	1805600
2003	1802490
2004	1803750
2005	1801260
2006	1799060
2007	1796200
2008	1797570
2009	1800680
2010	1795730
2011	1796700
2012	1796420
2013	1796980
2014	1797280
2015	1796750
2016	1795780
2017	1792356.04
2018	1791155.64
2019	1790449.469
2020	1785277.59
2021	1785279.48