Year	sq. km
1990	30
1991	30
1992	30
1993	30
1994	30
1995	30
1996	30
1997	30
1998	30
1999	30
2000	30
2001	30
2002	30
2003	30
2004	30
2005	30
2006	30
2007	30
2008	30
2009	30
2010	30
2011	30
2012	30
2013	30
2014	30
2015	30
2016	28
2017	27
2018	26
2019	25
2020	25
2021	24.333000000000002