Year	% of land area
1992	4.806446970787164
1993	4.7920564109943875
1994	4.777665851201611
1995	4.417901856382214
1996	4.101309540941143
1997	4.000575622391711
1998	3.8854511440495036
1999	3.8854511440495036
2000	3.8710605842567274
2001	3.856670024463952
2002	3.8134983450856237
2003	3.7991077852928474
2004	1.4390559792775939
2005	1.5829615772053534
2006	1.669304935962009
2007	1.640523816376457
2008	1.6549143761692329
2009	1.7988199740969923
2010	1.7988199740969923
2011	1.7988199740969923
2012	1.7988199740969923
2013	1.8707727730608719
2014	1.5829615772053534
2015	1.5829615772053534
2016	1.5829615772053534
2017	1.7383796229673336
2018	1.7729169664699957
2019	1.8074543099726579
2020	1.8405525974960428
2021	1.8405525974960428