Year	sq. km
1961	2080860
1962	2079011
1963	2073371
1964	2066875
1965	2060348
1966	2056932
1967	2055014
1968	2047430
1969	2047348
1970	2032066
1971	2011540
1972	2005279
1973	1998735
1974	1994596
1975	1989182
1976	1983652
1977	1981599
1978	1981218
1979	1975589
1980	1968782
1981	1965526
1982	1963930
1983	1952806
1984	1950622
1985	1946711
1986	1942913
1987	1940937
1988	1932368
1989	1927253
1990	1920957
1991	1898901
1992	1889924
1993	1885079
1994	1881093
1995	1864448
1996	1860532
1997	1854063.4
1998	1848208.8
1999	1846678.2
2000	1826719.4000000001
2001	1804636.2
2002	1780579.8
2003	1762696.3
2004	1751354
2005	1750504.7999999998
2006	1733196.1
2007	1711879.2
2008	1719884.3000000003
2009	1709564.9
2010	1694173.2
2011	1684479.1
2012	1675265.0999999999
2013	1671303.3000000003
2014	1654751.2099999997
2015	1652680.49
2016	1643015.4200000002
2017	1642336.406
2018	1637289.867
2019	1650653.641
2020	1632541.8630000001
2021	1629077.5289999999