Year	sq. km
1961	77130
1962	77920
1963	78720
1964	81520
1965	81320
1966	81300
1967	83050
1968	82810
1969	82530
1970	83100
1971	82790
1972	84300
1973	85960
1974	88620
1975	91920
1976	96740
1977	100900
1978	101400
1979	103940
1980	106250
1981	106700
1982	107400
1983	107800
1984	108200
1985	109100
1986	109800
1987	110200
1988	110600
1989	111000
1990	111400
1991	111570
1992	111150
1993	110650
1994	110150
1995	110150
1996	111050
1997	113350
1998	112850
1999	112350
2000	112340
2001	111840
2002	111350
2003	112400
2004	114700
2005	113550
2006	115800
2007	117900
2008	120100
2009	121000
2010	121000
2011	122600
2012	124300
2013	124690
2014	124980
2015	125270
2016	125560
2017	125900
2018	126130
2019	126360
2020	126590
2021	126830