Year	sq. km
1961	86480
1962	86460
1963	86440
1964	87260
1965	87240
1966	87220
1967	87200
1968	87180
1969	88680
1970	90530
1971	90580
1972	91560
1973	92440
1974	92920
1975	93600
1976	94280
1977	94730
1978	93570
1979	92930
1980	90610
1981	91280
1982	92160
1983	93210
1984	93420
1985	92880
1986	91940
1987	92060
1988	91700
1989	92190
1990	91910
1991	92100
1992	93550
1993	94220
1994	92830
1995	93480
1996	93240
1997	93470
1998	94200
1999	95260
2000	95510
2001	94990
2002	97630
2003	97840
2004	98300
2005	98240
2006	98060
2007	98050
2008	98810
2009	97890
2010	100380
2011	100720
2012	99220
2013	99430
2014	97610
2015	98340
2016	97026
2017	97429
2018	97005
2019	97005
2020	97005
2021	97005