Year	% of land area
1993	4.930693069306931
1994	4.326732673267326
1995	4.336633663366336
1996	3.653465346534653
1997	3.871287128712871
1998	4.930693069306931
1999	4.930693069306931
2000	5.544554455445545
2001	5.564356435643565
2002	5.564356435643565
2003	5.910891089108911
2004	4.942858530305489
2005	5.1228946906534265
2006	5.537005622564756
2007	5.535698372056866
2008	5.534560297440157
2009	5.699201497267787
2010	5.6994128192333005
2011	5.698288553718125
2012	5.698611818161096
2013	5.700157914200859
2014	5.700774524577092
2015	5.6982986242944484
2016	5.698831192022291
2017	5.699124250266783
2018	5.698819189797389
2019	5.698685897898082
2020	5.700555801712164
2021	5.700555801712164