Year	% of land area
1992	46.467117570873505
1993	45.013671031803135
1994	44.56756367822708
1995	43.86242624838106
1996	43.675348971074975
1997	43.70413009066053
1998	43.81925456900274
1999	43.15728881853504
2000	43.171679378327816
2001	43.21485105770614
2002	43.22924161749892
2003	43.258022737084474
2004	35.86127500359764
2005	36.26421067779537
2006	36.235429558209816
2007	36.221038998417036
2008	36.17786731903871
2009	35.94761836235429
2010	35.40077709022881
2011	35.14750323787595
2012	35.04101309540941
2013	35.77637070082026
2014	34.767592459346666
2015	34.797812634911494
2016	34.451000143905596
2017	34.31860699381206
2018	34.166067060008636
2019	34.143042164340194
2020	34.21931213124191
2021	34.24809325082745