Year	% of land area
1961	11.049601905560088
1962	11.058423943009638
1963	11.071656999183961
1964	11.084890055358285
1965	11.093712092807834
1966	11.102534130257382
1967	11.115767186431706
1968	11.137822280055579
1969	11.159877373679452
1970	11.181932467303323
1971	11.203987560927196
1972	11.226042654551069
1973	11.248097748174942
1974	11.270152841798813
1975	11.270152841798813
1976	11.292207935422686
1977	11.30544099159701
1978	11.314263029046558
1979	11.314263029046558
1980	11.33631812267043
1981	11.358373216294302
1982	11.367195253743851
1983	11.380428309918175
1984	11.402483403542048
1985	11.424538497165921
1986	11.446593590789792
1987	11.446593590789792
1988	11.446593590789792
1989	11.446593590789792
1990	11.451004609514568
1991	11.459826646964116
1992	11.468648684413665
1993	11.468648684413665
1994	11.468648684413665
1995	11.380428309918175
1996	11.380428309918175
1997	11.33631812267043
1998	11.33631812267043
1999	11.292207935422686
2000	11.292207935422686
2001	11.270152841798813
2002	11.270152841798813
2003	11.270152841798813
2004	11.270152841798813
2005	11.270152841798813
2006	11.286032509208002
2007	11.314263029046558
2008	11.33631812267043
2009	11.859906045301162
2010	12.540085132661389
2011	13.072495092741669
2012	13.62387243333848
2013	13.863831851966212
2014	14.225094285525241
2015	14.31375576189321
2016	14.411680377583203
2017	14.697955492821066
2018	14.81837630400741
2019	14.92247634591209
2020	14.951147967623122
2021	14.952471273240556