Year	% of land area
1990	2.0245946240069648
1991	2.0572423549896617
1992	2.089890085972358
1993	2.122537816955055
1994	2.155185547937752
1995	2.1878332789204484
1996	2.2204810099031453
1997	2.253128740885842
1998	2.2857764718685383
1999	2.318424202851235
2000	2.351071933833932
2001	2.3837196648166286
2002	2.4163673957993255
2003	2.451549648673675
2004	2.4845018249169253
2005	2.5171869041782426
2006	2.5490388280782006
2007	2.5815726421258987
2008	2.6142452624700505
2009	2.646917882814202
2010	2.67973642650983
2011	2.712410826117737
2012	2.745085225725644
2013	2.7777596253335513
2014	2.8104340249414586
2015	2.8431084245493654
2016	2.8431084245493654
2017	2.8431084245493654
2018	2.8431084245493654
2019	2.8431084245493654
2020	2.8431084245493654
2021	2.8431084245493654