Year	sq. km
1961	44890
1962	44890
1963	44890
1964	44890
1965	44890
1966	44890
1967	44890
1968	44890
1969	44890
1970	44890
1971	44890
1972	44890
1973	44890
1974	44890
1975	44890
1976	44890
1977	44890
1978	44890
1979	44890
1980	44890
1981	44890
1982	44890
1983	44890
1984	44890
1985	44890
1986	44890
1987	44890
1988	44890
1989	44890
1990	44890
1991	44890
1992	44890
1993	45430
1994	44700
1995	45820
1996	45850
1997	45620
1998	45470
1999	45680
2000	45730
2001	45730
2002	45710
2003	45960
2004	46500
2005	46720
2006	47350
2007	47290
2008	47270
2009	47594
2010	47557
2011	47528
2012	47490
2013	47806
2014	48122
2015	48438
2016	48754
2017	49071
2018	49116
2019	49182
2020	49160
2021	49170