Year	% of land area
1992	52.193866477942905
1993	52.271691436659594
1994	52.34951639537626
1995	52.427341354092945
1996	52.50516631280963
1997	52.5829912715263
1998	52.66081623024298
1999	52.738641188959654
2000	52.816466147676344
2001	53.04560037744751
2002	53.27473460721869
2003	53.50386883698985
2004	53.73300306676102
2005	53.9621372965322
2006	54.191271526303375
2007	54.42040575607455
2008	54.64953998584572
2009	54.87867421561688
2010	55.10780844538806
2011	55.50879924510498
2012	55.9097900448219
2013	54.91175523349436
2014	55.30278352887048
2015	55.69381182424661
2016	55.69933287324592
2017	57.03859649122806
2018	57.03859649122806
2019	57.03859649122806
2020	57.03859649122806
2021	57.03859649122806