Year	% of land area
1990	45.466630196936535
1991	45.50339168490154
1992	45.54015317286652
1993	45.576914660831505
1994	45.6136761487965
1995	45.65043763676149
1996	45.68719912472648
1997	45.723960612691464
1998	45.76072210065645
1999	45.797483588621446
2000	45.834245076586434
2001	45.84064551422319
2002	45.847045951859954
2003	45.853446389496725
2004	45.85984682713348
2005	45.866247264770244
2006	45.87264770240701
2007	45.879048140043764
2008	45.88544857768053
2009	45.89184901531729
2010	45.898249452954055
2011	45.89277899343545
2012	45.88730853391685
2013	45.88183807439825
2014	45.876367614879655
2015	45.87089715536106
2016	45.86542669584245
2017	45.85995623632385
2018	45.854485776805255
2019	45.84901531728666
2020	45.84354485776805
2021	45.838074398249454