Year	sq. km
1961	2635540
1962	2652270
1963	2653550
1964	2665180
1965	2680390
1966	2686810
1967	2691460
1968	2694460
1969	2674330
1970	2680420
1971	2674620
1972	2680480
1973	2698852
1974	2698113
1975	2705503
1976	2702350
1977	2704250
1978	2719770
1979	2717900
1980	2725780
1981	2718110
1982	2741406
1983	2717452
1984	2739428
1985	2734224
1986	2717680
1987	2733156
1988	2718482
1989	2727848
1990	2719904
1991	2722070
1992	2712782
1993	2715144
1994	2712726
1995	2711988
1996	2709530
1997	2719322
1998	2720704
1999	2721886
2000	2720531
2001	2718560
2002	2717760
2003	2714950
2004	2707940
2005	2706330
2006	2704400
2007	2699390
2008	2695143
2009	2697840
2010	2692459
2011	2700321
2012	2701290
2013	2705530
2014	2706030
2015	2706142.4
2016	2711956.1
2017	2711105.34
2018	2711578.6399999997
2019	2707019.1969999997
2020	2709441.59
2021	2706638.48