Year	% of land area
1993	73.26732673267327
1994	73.32673267326733
1995	73.33663366336634
1996	72.65346534653465
1997	72.87128712871286
1998	73.93069306930693
1999	73.93069306930693
2000	74.55445544554455
2001	74.57425742574257
2002	74.57425742574257
2003	74.92079207920793
2004	61.99237287172434
2005	62.152280424346884
2006	62.576427722478115
2007	62.56165384061878
2008	62.54879189883115
2009	62.707735894575414
2010	62.71006104872351
2011	62.69769086931595
2012	62.701247715187016
2013	62.7182592530622
2014	62.72504375447723
2015	62.697801674845586
2016	62.703661463526416
2017	62.70688595366002
2018	62.70352940426345
2019	62.70206280701773
2020	62.722637168983695
2021	62.722637168983695