Year	% of land area
2000	45.89167767503303
2001	45.79920739762219
2002	45.87516512549538
2003	45.97754293262879
2004	45.94782034346103
2005	45.67371202113606
2006	45.574636723910174
2007	45.14200792602378
2008	45.089167767503305
2009	45.033025099075296
2010	44.77212681638045
2011	44.111624834874505
2012	43.989431968295904
2013	44.138044914134746
2014	43.9663143989432
2015	43.85733157199472
2016	44.61030383091149
2017	43.82430647291942
2018	44.71598414795244
2019	44.795990752972266
2020	45.066357331572
2021	45.101387054161165