Year	% of land area
1992	54.06828334396937
1993	53.174856413529035
1994	49.872367581365666
1995	54.4033184428845
1996	54.41927249521379
1997	54.51499680918953
1998	54.64262922782387
1999	55.77536694320357
2000	54.530950861518825
2001	46.202935545628584
2002	46.02744097000638
2003	40.539246968730055
2004	41.54913848117422
2005	45.26164645820038
2006	44.52297383535418
2007	43.01052967453734
2008	42.63422417231751
2009	42.90386916633426
2010	44.23294774631033
2011	44.7697609854166
2012	45.348948527299996
2013	46.1332269644994
2014	47.12529928172386
2015	47.979249800478854
2016	47.15526324191437
2017	46.859085902204626
2018	47.05412741497685
2019	47.50878313637815
2020	46.99457042478441
2021	46.92221689825906