Year	sq. km
1990	85252.4
1991	84949.8
1992	84647.2
1993	84344.6
1994	84042
1995	83739.4
1996	83436.8
1997	83134.2
1998	82831.6
1999	82529
2000	82226.4
2001	81923.8
2002	81621.2
2003	81318.6
2004	81016
2005	80713.4
2006	80410.8
2007	80108.2
2008	79805.6
2009	79503
2010	79200.4
2011	78897.8
2012	78595.2
2013	78292.6
2014	77990
2015	77687.4
2016	77384.8
2017	77082.2
2018	76779.6
2019	76477
2020	76174.4
2021	75871.8