Year	sq. km
1990	46074
1991	45908.74
1992	45743.48
1993	45578.22
1994	45412.96
1995	45247.7
1996	45082.44
1997	44917.18
1998	44751.92
1999	44586.66
2000	44421.4
2001	44307.25
2002	44193.1
2003	44078.95
2004	43964.8
2005	43850.65
2006	43736.5
2007	43622.35
2008	43508.2
2009	43394.05
2010	43279.9
2011	43165.74
2012	43051.58
2013	42937.42
2014	42823.26
2015	42709.1
2016	42595
2017	42480.8
2018	42366.7
2019	42252.5
2020	42138.4
2021	42024.233