Year	% of land area
1961	2.127659574468085
1962	2.127659574468085
1963	2.127659574468085
1964	2.127659574468085
1965	2.127659574468085
1966	2.127659574468085
1967	2.127659574468085
1968	2.127659574468085
1969	2.127659574468085
1970	2.127659574468085
1971	2.127659574468085
1972	2.127659574468085
1973	2.127659574468085
1974	2.127659574468085
1975	2.127659574468085
1976	2.127659574468085
1977	2.127659574468085
1978	2.127659574468085
1979	2.127659574468085
1980	2.127659574468085
1981	2.127659574468085
1982	2.127659574468085
1983	2.127659574468085
1984	2.127659574468085
1985	2.127659574468085
1986	2.127659574468085
1987	2.127659574468085
1988	2.127659574468085
1989	2.127659574468085
1990	2.127659574468085
1991	2.127659574468085
1992	2.127659574468085
1993	2.127659574468085
1994	2.127659574468085
1995	2.127659574468085
1996	2.127659574468085
1997	2.127659574468085
1998	2.127659574468085
1999	2.127659574468085
2000	2.127659574468085
2001	1.5957446808510638
2002	1.8085106382978722
2003	1.8297872340425532
2004	1.723404255319149
2005	1.702127659574468
2006	1.6595744680851061
2007	1.6382978723404256
2008	1.6170212765957446
2009	1.6382978723404256
2010	1.6382978723404256
2011	1.6382978723404256
2012	1.6170212765957446
2013	1.723404255319149
2014	1.702127659574468
2015	1.723404255319149
2016	1.7446808510638296
2017	1.7446808510638296
2018	1.754255319148936
2019	1.6831914893617022
2020	1.6359574468085107
2021	1.5906382978723403