Year	Square Kilometers
1990	23240
1991	23184
1992	23128
1993	23072
1994	23016
1995	22960
1996	22904
1997	22848
1998	22792
1999	22736
2000	22680
2001	22626
2002	22572
2003	22518
2004	22464
2005	22410
2006	22354
2007	22298
2008	22242
2009	22186
2010	22130
2011	22074
2012	22018
2013	21962
2014	21906
2015	21850