Year	% of land area
1990	18.51851851851852
1991	18.51851851851852
1992	18.51851851851852
1993	18.51851851851852
1994	18.51851851851852
1995	18.51851851851852
1996	18.51851851851852
1997	18.51851851851852
1998	18.51851851851852
1999	18.51851851851852
2000	18.51851851851852
2001	18.51851851851852
2002	18.51851851851852
2003	18.51851851851852
2004	18.51851851851852
2005	18.51851851851852
2006	18.51851851851852
2007	18.51851851851852
2008	18.51851851851852
2009	18.51851851851852
2010	18.51851851851852
2011	18.51851851851852
2012	18.51851851851852
2013	18.51851851851852
2014	18.51851851851852
2015	18.51851851851852
2016	18.51851851851852
2017	18.51851851851852
2018	18.51851851851852
2019	18.51851851851852
2020	18.51851851851852
2021	18.51851851851852