Year	% of land area
1993	55.41607350847677
1994	55.441956774945
1995	55.39019024200854
1996	55.39019024200854
1997	55.39019024200854
1998	55.441956774945
1999	55.41607350847677
2000	55.39019024200854
2001	55.36430697554031
2002	47.26362106897891
2003	47.47534618868901
2004	47.00220036241263
2005	46.66696867719389
2006	46.16116504854369
2007	46.55922330097088
2008	46.240419471776285
2009	45.907172449508025
2010	45.628900686261815
2011	45.37148776382235
2012	45.65440890845526
2013	45.5969955969956
2014	45.53224553224553
2015	45.2532055433234
2016	45.17549540214998
2017	45.60290117860381
2018	45.62880455899495
2019	45.6399997409511
2020	45.64686659188977
2021	45.73056051142403