Year	% of land area
1992	11.440495035256872
1993	11.440495035256872
1994	11.440495035256872
1995	11.095121600230248
1996	11.239027198158007
1997	11.296589437329112
1998	11.397323355878545
1999	11.368542236292992
2000	11.411713915671319
2001	11.440495035256872
2002	11.498057274427975
2003	11.541228953806302
2004	6.504533026334725
2005	6.763563102604691
2006	6.648438624262484
2007	6.662829184055259
2008	6.605266944884155
2009	6.231112390271982
2010	5.684271118146496
2011	5.430997265793639
2012	5.3245071233270975
2013	5.982155705856957
2014	5.252554324363218
2015	5.291408835803713
2016	4.950352568714924
2017	4.662541372859405
2018	4.475464095553317
2019	4.417901856382214
2020	4.461073535760541
2021	4.489854655346093