Year	sq. km
1961	31811487.000000004
1962	31899349.099999998
1963	31984947.3
1964	32066257.8
1965	32162500.999999996
1966	32249076.900000002
1967	32329731.400000002
1968	32431846.599999998
1969	32510142
1970	32615236.700000003
1971	32747098.400000002
1972	32895538.900000002
1973	33029250.727
1974	33153277.755
1975	33262596.682000004
1976	33252775.459000003
1977	33400023.635999996
1978	33555803.214
1979	33677248.958000004
1980	33789016.581
1981	33844273.045
1982	33997820.09
1983	34150626.232999995
1984	34340870.127000004
1985	34574978.791999996
1986	34693394.115
1987	34838606.609
1988	34952077.903
1989	35065531.197
1990	35171297.09099999
1991	35255699.285
1992	35304059.82
1993	35162629.416999996
1994	35251044.929
1995	35254521.905
1996	35286190.738000005
1997	35471290.867
1998	35515600.616
1999	35590298.73399999
2000	35632029.33
2001	35659735.714999996
2002	35692764.90699999
2003	35599412.671
2004	35640024.19
2005	35560794.847
2006	35603829.606
2007	35648503.14
2008	35603353.820999995
2009	35636266.116
2010	35747944.679
2011	35777841.386
2012	35832811.346
2013	35885743.105000004
2014	35864672.77499999
2015	35911349.101
2016	35926751.429
2017	35946684.844
2018	35961051.175
2019	35948639.236999996
2020	35996204.158
2021	36006333.548