Year	% of land area
1961	2.898550724637681
1962	2.898550724637681
1963	2.898550724637681
1964	2.898550724637681
1965	2.898550724637681
1966	2.898550724637681
1967	2.898550724637681
1968	2.898550724637681
1969	2.898550724637681
1970	2.898550724637681
1971	2.898550724637681
1972	2.898550724637681
1973	2.898550724637681
1974	2.898550724637681
1975	2.898550724637681
1976	2.898550724637681
1977	2.898550724637681
1978	2.898550724637681
1979	2.898550724637681
1980	2.898550724637681
1981	2.898550724637681
1982	2.898550724637681
1983	2.898550724637681
1984	2.898550724637681
1985	2.898550724637681
1986	2.898550724637681
1987	2.898550724637681
1988	2.898550724637681
1989	2.898550724637681
1990	2.898550724637681
1991	2.898550724637681
1992	2.8169014084507045
1993	2.8169014084507045
1994	2.8169014084507045
1995	2.8169014084507045
1996	2.8169014084507045
1997	2.8169014084507045
1998	2.8169014084507045
1999	2.8169014084507045
2000	2.8309859154929575
2001	2.8309859154929575
2002	2.845070422535211
2003	2.8055555555555554
2004	2.780821917808219
2005	2.7432432432432434
2006	2.7567567567567566
2007	2.7199999999999998
2008	2.697368421052632
2009	2.697368421052632
2010	2.7034120734908136
2011	2.6857887874837028
2012	2.688311688311688
2013	2.688311688311688
2014	2.6977950713359276
2015	2.6735218508997427
2016	2.682926829268293
2017	2.6794871794871793
2018	2.6992287917737787
2019	2.6923076923076925
2020	2.67515923566879
2021	2.6582278481012658