Year	% of land area
1993	0.019801980198019802
1994	0.019801980198019802
1995	0.019801980198019802
1996	0.019801980198019802
1997	0.019801980198019802
1998	0.019801980198019802
1999	0.019801980198019802
2000	0.0297029702970297
2001	0.0297029702970297
2002	0.0297029702970297
2003	0.0297029702970297
2004	0.016531299432459828
2005	0.01652546674404331
2006	0.016528374992730615
2007	0.016524472752408554
2008	0.016521075514746738
2009	0.0165194246297617
2010	0.016520037157197975
2011	0.016516778416574274
2012	0.016517715414959697
2013	0.016522196852756115
2014	0.016523984129208965
2015	0.016516807606650575
2016	0.01651835128122403
2017	0.016519200725410965
2018	0.016518316492166344
2019	0.01651793013883502
2020	0.016523350149890332
2021	0.016523350149890332