Year	% of land area
1990	35.902794345189555
1991	35.90618774346739
1992	35.90958114174522
1993	35.91297454002305
1994	35.91636793830089
1995	35.919761336578716
1996	35.92315473485655
1997	35.92654813313438
1998	35.92994153141222
1999	35.93333492969005
2000	35.930860318573416
2001	35.956811075111915
2002	35.98276183165041
2003	36.00871258818891
2004	36.0346633447274
2005	36.0606141012659
2006	36.08656485780439
2007	36.11251561434289
2008	36.16739619536485
2009	36.19336772618923
2010	36.21933925701361
2011	36.23224154676425
2012	36.245143836514906
2013	36.25804612626555
2014	36.270948416016196
2015	36.283850705766845
2016	36.28166057382671
2017	36.26305577013365
2018	36.26101414978714
2019	36.25897197735292
2020	36.25693035700641
2021	36.61244105348219