Year	Square Kilometers
1990	49540
1991	49579
1992	49618
1993	49657
1994	49696
1995	49735
1996	49774
1997	49813
1998	49852
1999	49891
2000	49930
2001	50746
2002	51562
2003	52378
2004	53194
2005	54010
2006	54552
2007	55094
2008	55636
2009	56178
2010	56720
2011	56640
2012	56560
2013	56480
2014	56400
2015	56320