Year	sq. km
1961	20134524
1962	20134524
1963	20134524
1964	20134524
1965	20134524
1966	20134524
1967	20134524
1968	20134524
1969	20134524
1970	20134524
1971	20134524
1972	20134524
1973	20134524
1974	20134124
1975	20133724
1976	20133724
1977	20133724
1978	20133724
1979	20133724
1980	20133724
1981	20133724
1982	20133724
1983	20133724
1984	20133724
1985	20133724
1986	20133724
1987	20133724
1988	20133724
1989	20133724
1990	20133724
1991	20133724
1992	20133724
1993	20133724
1994	20126801
1995	20126801
1996	20126801
1997	20126801
1998	20126801
1999	20126801
2000	20127151
2001	20127151
2002	20127151
2003	20127151
2004	20273927.922
2005	20273913.092
2006	20274015.252
2007	20274111.665
2008	20273863.89
2009	20273886.284
2010	20274534.055
2011	20274847.05
2012	20398637.142
2013	20398529.325999998
2014	20398482.467
2015	20398536.128
2016	20398270.968000002
2017	20398229.053
2018	20398190.143000003
2019	20398202.404
2020	20398133.094
2021	20398133.094