Year	sq. km
1990	614411.0999999999
1991	612356.4339999999
1992	632426.7479999998
1993	630405.0719999998
1994	628383.396
1995	626361.72
1996	624340.0439999999
1997	622318.3679999999
1998	620296.6919999998
1999	618275.0159999998
2000	616253.3400000001
2001	614272.9159999999
2002	612292.492
2003	610312.0679999997
2004	608331.644
2005	606351.2199999999
2006	611836.7959999997
2007	610057.3720000001
2008	608277.948
2009	606498.5239999999
2010	604719.1
2011	602668.88
2012	600618.6599999999
2013	598568.44
2014	596518.2199999999
2015	594467.9999999998
2016	592247.8999999999
2017	590206.7999999999
2018	587984.7
2019	585765.2
2020	583546.2999999998
2021	581326.9989999998