Year	% of land area
1992	11.742606252195293
1993	11.735265191429574
1994	11.727924130663856
1995	11.720583069898138
1996	11.713242009132422
1997	11.705900948366702
1998	11.698559887600982
1999	11.691218826835264
2000	11.683877766069548
2001	11.676571829996488
2002	11.669265893923427
2003	11.661959957850367
2004	11.65465402177731
2005	11.64734808570425
2006	11.640042149631192
2007	11.63273621355813
2008	11.625430277485073
2009	11.618124341412011
2010	11.610818405338954
2011	11.603512469265894
2012	11.596206533192834
2013	11.588900597119775
2014	11.581594661046717
2015	11.574288724973655
2016	11.566912539515279
2017	11.559536354056902
2018	11.552160168598526
2019	11.544783983140148
2020	11.53740779768177
2021	11.530031612223393