Year	Square Kilometers
1990	500
1991	497.3
1992	494.7
1993	492
1994	489.3
1995	486.6
1996	484
1997	481.3
1998	478.6
1999	476
2000	473.3
2001	470.6
2002	467.9
2003	465.3
2004	462.6
2005	459.9
2006	457.2
2007	454.6
2008	451.9
2009	449.3
2010	446.6
2011	443.9
2012	441.3
2013	438.6
2014	436
2015	433.3