Year	% of land area
2000	0.38843097193197795
2001	0.38843097193197795
2002	0.38843097193197795
2003	0.38843097193197795
2004	0.38843097193197795
2005	0.7768619438639559
2006	0.7768619438639559
2007	0.7768619438639559
2008	0.7768619438639559
2009	0.6059523162138856
2010	0.582646457897967
2011	0.5865307676172867
2012	0.6098366259332054
2013	0.5942993870559263
2014	0.6020680064945658
2015	0.6020680064945658
2016	0.5981836967752461
2017	0.6036217303822937
2018	0.6067291781577496
2019	0.6043985923261578
2020	0.6040101613542258
2021	0.6051754542700216