Year	sq. km
1961	1406830
1962	1406830
1963	1406830
1964	1406810
1965	1406830
1966	1406830
1967	1406830
1968	1406830
1969	1406520
1970	1406840
1971	1406830
1972	1406830
1973	1406830
1974	1406830
1975	1406830
1976	1255520
1977	1259750
1978	1259170
1979	1247130
1980	1245870
1981	1245190
1982	1245250
1983	1249760
1984	1246070
1985	1245870
1986	1245310
1987	1248890
1988	1252340
1989	1255320
1990	1256560
1991	1261300
1992	1235900
1993	1191240
1994	1184690
1995	1184690
1996	1184690
1997	1288910
1998	1291320
1999	1302820
2000	1304700
2001	1301295
2002	1301180
2003	1142714
2004	1141527
2005	1139278
2006	1147273
2007	1146800
2008	1145070
2009	1142700.562
2010	1142100.3
2011	1141878
2012	1140679.033
2013	1140302.8
2014	1136820
2015	1136644.1
2016	1135607.9
2017	1134671.9
2018	1134330
2019	1133735
2020	1126995.469
2021	1126312