Year	sq. km
1992	139960
1993	139960
1994	139960
1995	139960
1996	139960
1997	139960
1998	139960
1999	139960
2000	139960
2001	139960
2002	139960
2003	139960
2004	139960
2005	139960
2006	139960
2007	139960
2008	139960
2009	139960
2010	139960
2011	139960
2012	139960
2013	139960
2014	138786
2015	138790
2016	138790
2017	138790
2018	138790
2019	138790
2020	138790
2021	138790