Year	sq. km
1961	8967929.3
1962	8984469.3
1963	9010229.3
1964	9029049.3
1965	9047599.3
1966	9053099.3
1967	9060419.3
1968	9073169.3
1969	9070119.3
1970	9079704.299999999
1971	9087639.3
1972	9108669.3
1973	9124251.3
1974	9120751.3
1975	9137262.3
1976	9147821.717
1977	9154764.133
1978	9177946.55
1979	9181515.967
1980	9204706.383
1981	9209771.8
1982	9239432.217
1983	9230908.633
1984	9252700.3
1985	9302317.967
1986	9334690.633
1987	9373122.899999999
1988	9413806.967
1989	9450230.033
1990	9462678
1991	9492238.467000002
1992	9533275.535
1993	9412445.284
1994	9473903.149000002
1995	9545447.105
1996	9585101.718
1997	9633400.827
1998	9657457.156
1999	9707191.054
2000	9738481.23
2001	9785263.281
2002	9808025.138
2003	9870311.268
2004	9885653.852
2005	9972811.375
2006	10010565.286999999
2007	10050278.199000001
2008	10071120.705000002
2009	10117792.354
2010	10160511.226
2011	10205496.706
2012	10265058.273
2013	10312408.726
2014	10342584.597000001
2015	10374520.156000001
2016	10405861.933999998
2017	10437094.501000002
2018	10469586.092
2019	10479543.888999999
2020	10502856.757000001
2021	10511870.877