Year	sq. km
1961	7238329.3
1962	7250689.3
1963	7273079.3
1964	7283879.3
1965	7290909.3
1966	7292449.3
1967	7299929.3
1968	7312629.3
1969	7320169.3
1970	7324844.3
1971	7333449.300000001
1972	7351229.3
1973	7355021.3
1974	7354182.3
1975	7361342.3
1976	7371671.717
1977	7375944.132999999
1978	7392256.55
1979	7390403.967
1980	7399811.382999999
1981	7411643.8
1982	7418522.217
1983	7428526.632999999
1984	7435715.3
1985	7475889.967
1986	7519678.633
1987	7545136.3
1988	7593513.967
1989	7618600.632999999
1990	7633663.199999999
1991	7652498.267000001
1992	7677017.935
1993	7549939.284
1994	7595600.749000001
1995	7641791.305000001
1996	7682133.518000001
1997	7720448.227
1998	7738531.1559999995
1999	7779307.654
2000	7809601.2299999995
2001	7848578.2809999995
2002	7871470.138
2003	7932185.268
2004	7950532.852
2005	8037614.375
2006	8071408.2870000005
2007	8112954.899
2008	8137619.305
2009	8183660.954000001
2010	8223770.825999999
2011	8256127.306
2012	8316580.873
2013	8361673.3259999985
2014	8385501.197000001
2015	8416148.756
2016	8439885.534
2017	8466785.101
2018	8498237.692
2019	8512539.489
2020	8528882.357
2021	8539885.477