Year	% of land area
1992	2.107481559536354
1993	2.107481559536354
1994	2.28310502283105
1995	2.072356866877415
1996	1.966982788900597
1997	1.510361784334387
1998	1.3347383210396908
1999	1.3347383210396908
2000	1.3347383210396908
2001	1.3347383210396908
2002	1.2644889357218125
2003	1.36986301369863
2004	1.7562346329469618
2005	1.7562346329469618
2006	1.7913593256059008
2007	1.8967334035827188
2008	1.8967334035827188
2009	1.8616087109237796
2010	1.9353705655075517
2011	1.875658587987355
2012	1.9915700737618547
2013	2.026694766420794
2014	2.012644889357218
2015	2.0231822971548996
2016	2.0372321742184756
2017	2.0407446434843695
2018	2.0758693361433087
2019	2.107481559536354
2020	2.107481559536354
2021	2.1180189673340357