Year	sq. km
1990	56720
1991	56828.76
1992	56937.52
1993	57046.28
1994	57155.04
1995	57263.8
1996	57372.56
1997	57481.32
1998	57590.08
1999	57698.84
2000	57807.6
2001	57988.87
2002	58170.14
2003	58351.41
2004	58532.68
2005	58713.95
2006	58895.22
2007	59076.49
2008	59257.76
2009	59439.03
2010	59620.3
2011	59620.3
2012	59620.3
2013	59620.3
2014	59620.3
2015	59620.3
2016	59620.3
2017	59620.3
2018	59620.3
2019	59620.3
2020	59620.3
2021	59620.3