Year	% of land area
1992	42.7798828125
1993	42.58779296875
1994	42.395703125
1995	42.20361328125
1996	42.0115234375
1997	41.81943359375
1998	41.62734375
1999	41.43525390625
2000	41.2431640625
2001	41.22560546875
2002	41.208046875
2003	41.19048828125
2004	41.1729296875
2005	41.15537109375
2006	41.1378125
2007	41.12025390625
2008	41.1026953125
2009	41.08513671875
2010	41.067578125
2011	41.293515625
2012	41.519453125
2013	41.745390625
2014	41.971328125
2015	42.197265625
2016	42.5099609375
2017	42.7326171875
2018	42.7326171875
2019	42.7326171875
2020	42.7326171875
2021	42.7326171875