Year	% of land area
1992	0.7019783024888321
1993	0.7179323548181238
1994	0.6381620931716656
1995	0.6860242501595405
1996	0.7019783024888321
1997	0.6860242501595405
1998	0.6860242501595405
1999	0.6860242501595405
2000	0.6860242501595405
2001	0.6860242501595405
2002	0.6860242501595405
2003	0.6860242501595405
2004	0.5232929164007658
2005	0.6349712827058073
2006	0.5679642629227823
2007	0.4770261646458201
2008	0.4371759074591145
2009	0.4419625049860391
2010	0.48982848025528525
2011	0.4930274116858665
2012	0.5073874333854549
2013	0.5185480654168328
2014	0.5442936951316839
2015	0.5586592178770949
2016	0.5539414450368763
2017	0.5667214763493559
2018	0.5748044068337856
2019	0.5605237943149153
2020	0.5653145959757266
2021	0.5781823989777991