Year	% of land area
1992	75.22396952737643
1993	75.43676717809036
1994	75.43676717809036
1995	75.54316600344733
1996	75.54316600344733
1997	75.54316600344733
1998	75.54316600344733
1999	75.62828506373289
2000	75.54316600344733
2001	75.54316600344733
2002	75.22396952737643
2003	74.88349328623411
2004	74.58557657523461
2005	74.22382056902092
2006	73.84078479773584
2007	73.52158832166494
2008	73.09599302023706
2009	72.78743642670184
2010	72.35120124273828
2011	72.0064690485817
2012	72.0064690485817
2013	72.0064690485817
2014	72.0064690485817
2015	72.0064690485817
2016	72.0064690485817
2017	72.0064690485817
2018	72.0064690485817
2019	72.0064690485817
2020	72.0064690485817
2021	72.0064690485817