Year	sq. km
1961	90180
1962	91140
1963	92580
1964	98730
1965	98710
1966	98850
1967	98880
1968	99250
1969	99500
1970	99800
1971	100300
1972	101000
1973	101800
1974	102640
1975	104070
1976	105380
1977	105380
1978	106100
1979	106100
1980	106800
1981	107600
1982	108400
1983	113000
1984	115000
1985	116000
1986	118170
1987	118170
1988	118170
1989	118620
1990	119620
1991	120320
1992	120520
1993	120820
1994	121020
1995	121220
1996	121720
1997	121720
1998	122420
1999	122620
2000	125120
2001	126120
2002	128120
2003	131120
2004	132620
2005	132620
2006	134627.5
2007	136635
2008	139142.5
2009	141150
2010	142650
2011	143650
2012	144150
2013	144150
2014	144150
2015	144150
2016	144150
2017	144150
2018	144150
2019	144150
2020	144150
2021	144150