Year	Square Kilometers
1990	138094.9
1991	141262.4
1992	144429.8
1993	147597.3
1994	150764.7
1995	153932.2
1996	157099.6
1997	160267.1
1998	163434.5
1999	166602
2000	169769.4
2001	170379.7
2002	170990
2003	171600.3
2004	172210.6
2005	172820.9
2006	174751.1
2007	176681.3
2008	178611.6
2009	180541.8
2010	182472
2011	182813.3
2012	183154.7
2013	183496
2014	183837.4
2015	184178.7