Year	% of land area
1990	14.75247752938465
1991	14.752475992932318
1992	14.75247445647999
1993	14.752472920027653
1994	14.752471383575324
1995	14.752469847122992
1996	14.752469078896826
1997	14.752467542444494
1998	14.752466005992165
1999	14.752464469539833
2000	14.752462933087504
2001	14.727890450948758
2002	14.703317968810016
2003	14.678745486671277
2004	14.654173004532534
2005	14.629600522393796
2006	14.605028040255053
2007	14.58045555811631
2008	14.555883075977569
2009	14.531309825612663
2010	14.506737343473915
2011	14.499144196051317
2012	14.491551048628715
2013	14.483957901206116
2014	14.476364753783514
2015	14.468771606360914
2016	14.468771606360914
2017	14.468771606360914
2018	14.468771606360914
2019	14.468771606360914
2020	14.468771606360914
2021	14.468771606360914