Year	% of land area
1992	14.177061149984787
1993	13.596358118361154
1994	13.084395871281117
1995	12.541755238384452
1996	12.116610993015488
1997	12.120291616038882
1998	11.72895776359769
1999	11.27659574468085
2000	10.188564476885645
2001	9.276155717761556
2002	9.154501216545013
2003	9.066017645269241
2004	9.063260340632603
2005	9.182122225600487
2006	9.212526603830952
2007	9.212526603830952
2008	9.212526603830952
2009	9.151717847370021
2010	9.101978691019786
2011	9.101978691019786
2012	8.977480219111381
2013	8.972019464720194
2014	7.238442822384428
2015	7.238442822384428
2016	7.147201946472019
2017	7.205837640620249
2018	7.124763952282631
2019	7.048613539541263
2020	6.9090090802381665
2021	6.854716408856536