Year	% of land area
1992	1.1709378819868876
1993	1.1707408600955662
1994	1.170543838204245
1995	1.1703468163129236
1996	1.1701497944216024
1997	1.1699527725302812
1998	1.16975575063896
1999	1.1695587287476388
2000	1.1693617068563174
2001	1.1665930288550581
2002	1.1638243138126458
2003	1.1610556358113864
2004	1.158286957810127
2005	1.1555182798088677
2006	1.1527495647664554
2007	1.1499808867651962
2008	1.1472122087639365
2009	1.1444434937215247
2010	1.1416748157202652
2011	1.1584379375486165
2012	1.1752010223358151
2013	1.1919641071230138
2014	1.2087272289513649
2015	1.2254903137385638
2016	1.2363262584731636
2017	1.2471607956439603
2018	1.2579920731933179
2019	1.26882246175501
2020	1.2796532948105346
2021	1.2904838315368377