Year	sq. km
1992	20140
1993	20140
1994	20140
1995	20140
1996	20140
1997	20140
1998	20140
1999	20140
2000	20140
2001	20140
2002	20140
2003	20140
2004	20140
2005	20140
2006	20140
2007	20140
2008	20146.2
2009	20145.8
2010	20146.2
2011	20146
2012	20145.7
2013	20140
2014	20140
2015	20142.6
2016	20142
2017	20138.1
2018	20136.4
2019	20136.4
2020	20136.4
2021	20136.4