Year	sq. km
1961	8619455.32
1962	8618657.32
1963	8619762.32
1964	8611844.32
1965	8604091.32
1966	8602106.32
1967	8598310.32
1968	8592330.32
1969	8602094.32
1970	8575157.32
1971	8555206.32
1972	8552603.32
1973	8544531.32
1974	8534784.32
1975	8524587.32
1976	8518130.32
1977	8516819.32
1978	8516476.32
1979	8519669.607
1980	8509583.886
1981	8505118.202
1982	8488908.714
1983	8472348.370000001
1984	8479049.882
1985	8479941.844
1986	8479359.337000001
1987	8486652.278
1988	8479591.361
1989	8479685.586
1990	8470073.623
1991	8451683.46
1992	8440236.108
1993	8403943.896
1994	8390382.822999999
1995	8313483.8100000005
1996	8291139.115
1997	8304980.611
1998	8290356.174
1999	8280137.011
2000	8265184.495
2001	8235005.076
2002	8197398.646
2003	8162478.079
2004	8142799.149
2005	8130249.720999999
2006	8106856.577
2007	8063701.376
2008	8059555.263
2009	8037178.083000001
2010	8081865.857000001
2011	8058071.955999999
2012	8048706.405000001
2013	8042732.191000001
2014	8027320.968000001
2015	8018675.625
2016	8008684.210999999
2017	8004457.199999999
2018	7990637.3100000005
2019	7983777.351
2020	7964421.756
2021	7960695.084000001