Year	% of land area
1990	65.34407027818449
1991	65.30893118594436
1992	65.27379209370424
1993	65.23865300146413
1994	65.20351390922401
1995	65.1683748169839
1996	65.13323572474377
1997	65.09809663250367
1998	65.06295754026354
1999	65.02781844802342
2000	64.99267935578331
2001	64.9575402635432
2002	64.92240117130308
2003	64.88726207906296
2004	64.85212298682283
2005	64.81698389458272
2006	64.7818448023426
2007	64.74670571010249
2008	64.71156661786237
2009	64.67642752562226
2010	64.64128843338214
2011	64.60614934114201
2012	64.5710102489019
2013	64.53587115666178
2014	64.50073206442167
2015	64.46559297218155
2016	64.43045387994142
2017	64.39531478770132
2018	64.35139092240118
2019	64.30746705710102
2020	64.26354319180088
2021	64.21961932650073