Year	% of land area
2000	49.71916440729318
2001	49.71916440729318
2002	49.71916440729318
2003	49.71916440729318
2004	49.71916440729318
2005	50.10759537922516
2006	50.10759537922516
2007	50.884457323089116
2008	50.884457323089116
2009	50.76792803150953
2010	50.89999456196639
2011	50.98933368551075
2012	51.04759833130055
2013	50.83784560645728
2014	50.88057301336979
2015	50.98933368551075
2016	50.748894913884854
2017	50.94582941665436
2018	51.10159023639908
2019	51.11440845847285
2020	51.325714907203846
2021	51.587905813257926