Year	% of land area
1992	10.01521143900213
1993	10.04855842185129
1994	10.10928961748634
1995	10.170057698147586
1996	10.227755845733375
1997	10.28857837181045
1998	10.349437860832573
1999	10.410334346504559
2000	10.474452554744525
2001	10.565997566909974
2002	10.657542579075425
2003	10.75235777304533
2004	10.840632603406327
2005	10.928853754940711
2006	11.02037093341441
2007	11.111888111888112
2008	11.203405290361811
2009	11.294922468835512
2010	11.400304414003044
2011	11.47275494672755
2012	11.54169202678028
2013	11.60705596107056
2014	11.679440389294403
2015	11.751824817518248
2016	11.754866180048662
2017	11.751292186074796
2018	11.752971692519148
2019	11.752757260710517
2020	11.75322187285234
2021	11.722778283287838