Year	% of land area
1992	2.2021234762092017
1993	2.12347620920173
1994	2.0448289421942585
1995	1.966181675186787
1996	1.9268580416830514
1997	1.84821077467558
1998	1.8875344081793157
1999	1.7695635076681087
2000	1.730239874164373
2001	1.730239874164373
2002	1.730239874164373
2003	1.730239874164373
2004	1.8875344081793157
2005	1.533621706645694
2006	1.4942980731419582
2007	1.426872770511296
2008	1.426872770511296
2009	1.387787470261697
2010	1.387787470261697
2011	1.387787470261697
2012	1.4274385408406027
2013	1.4670896114195082
2014	1.506740681998414
2015	1.5463917525773196
2016	1.5860428231562251
2017	1.5860428231562251
2018	1.625693893735131
2019	1.625693893735131
2020	1.625693893735131
2021	1.625693893735131