Year	% of land area
2006	55.509293680297404
2007	57.003717472118964
2008	58.49814126394052
2009	59.99256505576208
2010	61.486988847583646
2011	61.486988847583646
2012	61.486988847583646
2013	61.486988847583646
2014	61.486988847583646
2015	61.486988847583646
2016	61.486988847583646
2017	61.486988847583646
2018	61.486988847583646
2019	61.486988847583646
2020	61.486988847583646
2021	61.486988847583646