Year	Square Kilometers
1990	19450
1991	19450
1992	19600
1993	19675
1994	19750
1995	19825
1996	19900
1997	19975
1998	20050
1999	20125
2000	20200
2001	20402
2002	20604
2003	20806
2004	21008
2005	21210
2006	21308
2007	21406
2008	21504
2009	21602
2010	21700
2011	21720
2012	21740
2013	21760
2014	21780
2015	21800