Year	% of land area
1992	11.45482293281421
1993	11.50587019479193
1994	11.55691745676965
1995	11.607964718747372
1996	11.659011980725092
1997	11.710059242702814
1998	11.778799403071293
1999	11.885279003687806
2000	11.951092548877188
2001	12.006046922667183
2002	12.058811639110122
2003	12.108628950297632
2004	12.160463034642927
2005	12.217000967819985
2006	12.27518907995208
2007	12.331169444141885
2008	12.386262359761336
2009	12.441808477161047
2010	12.4914658343012
2011	12.600995668900772
2012	12.710826538266106
2013	12.820503514438839
2014	12.929708575783602
2015	13.039534011589224
2016	13.154411515664691
2017	13.2731460646972
2018	13.41393036029714
2019	13.553367048176737
2020	13.694189676451371
2021	13.832990925589836