Year	sq. km
1961	7076222.8
1962	7086182.8
1963	7104742.8
1964	7117222.8
1965	7126572.8
1966	7131692.8
1967	7135572.8
1968	7151532.8
1969	7160832.800000001
1970	7166472.8
1971	7184382.8
1972	7192442.8
1973	7198724.8
1974	7199235.8
1975	7213945.800000001
1976	7222922.8
1977	7227662.8
1978	7244142.8
1979	7249442.8
1980	7261042.800000001
1981	7274452.8
1982	7283962.8
1983	7299292.8
1984	7309802.8
1985	7360522.8
1986	7406412.8
1987	7429472.8
1988	7477662.8
1989	7505602.8
1990	7522782.7
1991	7553383.100000001
1992	7599132.102
1993	7726242.784
1994	7779143.582
1995	7833892.472
1996	7862294.018
1997	7893271.11
1998	7923108.216
1999	7962762.65
2000	7993880.862
2001	8028664.14
2002	8051398.843
2003	8105263.808999999
2004	8113864.28
2005	8189794.379
2006	8217107.464000001
2007	8246775.779
2008	8270201.397999999
2009	8312413.001
2010	8351226.746
2011	8390214.511
2012	8448354.167
2013	8493815.023
2014	8522240.388
2015	8550635.532000002
2016	8572282.952
2017	8595891.932999998
2018	8625195.558
2019	8637544.22
2020	8650540.42
2021	8659330.42