Year	% of land area
1992	3.16430106611623
1993	3.3749707403230267
1994	3.5962802970655203
1995	3.7026791224224884
1996	3.7026791224224884
1997	3.7026791224224884
1998	3.7026791224224884
1999	3.8941970080650314
2000	4.128274423850361
2001	4.3410720745642974
2002	4.3410720745642974
2003	4.3410720745642974
2004	4.3410720745642974
2005	4.3410720745642974
2006	4.3410720745642974
2007	4.3410720745642974
2008	4.234673249207329
2009	4.234673249207329
2010	4.128274423850361
2011	4.128274423850361
2012	4.128274423850361
2013	4.128274423850361
2014	4.128274423850361
2015	4.128274423850361
2016	4.128274423850361
2017	4.128274423850361
2018	4.128274423850361
2019	4.128274423850361
2020	4.128274423850361
2021	4.128274423850361