Year	% of land area
1992	46.02744097000638
1993	45.118059987236755
1994	41.320995532865346
1995	45.724313975749844
1996	45.724313975749844
1997	45.91576260370134
1998	46.10721123165284
1999	47.11231652839821
2000	45.91576260370134
2001	26.021059349074665
2002	26.148691767708996
2003	24.32992980216975
2004	25.78813018506701
2005	30.41640076579451
2006	29.974473516273132
2007	29.285258455647735
2008	29.700837654567213
2009	32.76745113681691
2010	33.94335859593139
2011	34.87411047643361
2012	36.067587835466064
2013	36.545672118069405
2014	37.51316839584996
2015	34.667198723064644
2016	34.20708151080745
2017	33.58343576890535
2018	33.769758901484906
2019	35.32258064516129
2020	35.9214308527627
2021	36.3999361124421