Year	Square Kilometers
1990	22160
1991	22064
1992	21968
1993	21872
1994	21776
1995	21680
1996	21584
1997	21488
1998	21392
1999	21296
2000	21200
2001	21104
2002	21008
2003	20912
2004	20816
2005	20720
2006	20620
2007	20520
2008	20420
2009	20320
2010	20220
2011	20120
2012	20020
2013	19920
2014	19820
2015	19720