Year	sq. km
1990	275.4
1991	276.4
1992	277.4
1993	278.4
1994	279.4
1995	280.4
1996	281.4
1997	282.4
1998	283.4
1999	284.4
2000	285.4
2001	285.4
2002	285.4
2003	285.4
2004	285.4
2005	285.4
2006	285.4
2007	285.4
2008	285.4
2009	285.4
2010	285.4
2011	285.4
2012	285.4
2013	285.4
2014	285.4
2015	285.4
2016	285.4
2017	285.4
2018	285.4
2019	285.4
2020	285.4
2021	285.4