Year	% of land area
1990	10.228969194312796
1991	10.270941943127962
1992	10.312914691943128
1993	10.354887440758294
1994	10.39686018957346
1995	10.438832938388625
1996	10.480805687203793
1997	10.522778436018957
1998	10.564751184834122
1999	10.606723933649288
2000	10.648696682464456
2001	10.690106635071091
2002	10.731516587677724
2003	10.772926540284361
2004	10.814336492890995
2005	10.855746445497632
2006	10.897156398104265
2007	10.9385663507109
2008	10.979976303317535
2009	11.031188852653424
2010	11.072635635932405
2011	11.02461447212337
2012	10.973309608540925
2013	10.931730483823094
2014	10.880379934698723
2015	10.835461835461837
2016	10.863082863082862
2017	10.89100089100089
2018	10.91862191862192
2019	10.946539946539946
2020	10.974160974160974
2021	11.001980991980991