Year	% of land area
1971	2.272727272727273
1972	2.272727272727273
1973	2.272727272727273
1974	2.272727272727273
1975	2.272727272727273
1976	2.272727272727273
1977	2.272727272727273
1978	2.272727272727273
1979	2.272727272727273
1980	2.272727272727273
1981	2.272727272727273
1982	2.272727272727273
1983	2.272727272727273
1984	2.272727272727273
1985	2.272727272727273
1986	2.272727272727273
1987	2.272727272727273
1988	2.272727272727273
1989	2.272727272727273
1990	2.272727272727273
1991	2.272727272727273
1992	2.272727272727273
1993	2.272727272727273
1994	2.272727272727273
1995	2.272727272727273
1996	2.272727272727273
1997	2.272727272727273
1998	2.272727272727273
1999	2.272727272727273
2000	2.272727272727273
2001	2.272727272727273
2002	2.272727272727273
2003	2.272727272727273
2004	2.272727272727273
2005	2.272727272727273
2006	2.272727272727273
2007	2.272727272727273
2008	2.272727272727273
2009	2.272727272727273
2010	2.272727272727273
2011	2.272727272727273
2012	2.272727272727273
2013	2.272727272727273
2014	2.272727272727273
2015	2.272727272727273
2016	2.272727272727273
2017	2.272727272727273
2018	2.272727272727273
2019	2.272727272727273
2020	2.272727272727273
2021	2.272727272727273