Year	sq. km
1961	30981434
1962	31070136.1
1963	31157054.3
1964	31243984.8
1965	31338107
1966	31421902.900000002
1967	31502637.400000002
1968	31602852.6
1969	31681728
1970	31788362.700000003
1971	31917674.4
1972	32069684.900000002
1973	32204016.727
1974	32321683.755
1975	32429632.682
1976	32414339.042
1977	32561884.803
1978	32718531.964
1979	32839995.291
1980	32954020.498
1981	33011814.545
1982	33167729.172999997
1983	33321402.9
1984	33509988.127
1985	33742648.125
1986	33861884.782000005
1987	34011128.609000005
1988	34125061.236
1989	34243685.864
1990	34350133.09099999
1991	34435816.618
1992	34489148.487
1993	34349799.416999996
1994	34438454.558
1995	34443753.899
1996	34480114.543
1997	34665781.532
1998	34709478.258
1999	34785172.732
2000	34832825.794
2001	34867728.47099999
2002	34905695.738000005
2003	34821827.973
2004	34862101.535
2005	34788303.006
2006	34834645.908999994
2007	34890503.529
2008	34845152.644999996
2009	34880422.126
2010	35004274.55899999
2011	35034552.79
2012	35101231.07299999
2013	35153442.445999995
2014	35135477.44
2015	35185680.699
2016	35209927.44100001
2017	35235576.47899999
2018	35253289.434
2019	35241783.129999995
2020	35299226.664
2021	35315056.868