Year	sq. km
1961	9563665
1962	9582395
1963	9596675
1964	9618525
1965	9645275
1966	9661805
1967	9674645
1968	9685985
1969	9674665
1970	9700310
1971	9723935
1972	9749255
1973	9769695
1974	9781775
1975	9797995
1976	9654905
1977	9672225
1978	9695725
1979	9701640
1980	9699915
1981	9674661
1982	9713204.4
1983	9706140.4
1984	9747416.6
1985	9775427
1986	9773547
1987	9808608
1988	9822927
1989	9850963
1990	9844240.9
1991	9883563.9
1992	9896861.700000001
1993	9880865.700000001
1994	9911762.5
1995	9953908.9
1996	9972565.5
1997	10100219.15
1998	10119973.307
1999	10146955.504
2000	10146377.201
2001	10163912.308
2002	10173607.795
2003	10020882.292
2004	10032548.739
2005	9879528.796
2006	9901112.923
2007	9918306.52
2008	9923486.607
2009	9946073.515
2010	9956585.113
2011	9979335.395
2012	9986877.479
2013	10011765.318
2014	10015370.637
2015	10048771.249
2016	10063049.886999998
2017	10075090.441
2018	10090180.655000001
2019	10086810.73
2020	10095968.554000001
2021	10100188.759