Year	% of land area
2006	38.28996282527881
2007	38.215613382899626
2008	38.141263940520446
2009	38.215613382899626
2010	38.066914498141266
2011	38.141263940520446
2012	38.141263940520446
2013	16.589591078066913
2014	17.124163568773234
2015	17.20446096654275
2016	19.01115241635688
2017	19.055762081784387
2018	19.092936802973977
2019	19.107806691449813
2020	19.178438661710036
2021	19.00074349442379