Year	Square Kilometers
1990	176449
1991	175330.1
1992	174211.2
1993	173092.3
1994	171973.4
1995	170854.5
1996	169735.5
1997	168616.6
1998	167497.7
1999	166378.8
2000	165259.9
2001	165947.3
2002	166634.8
2003	167322.2
2004	168009.7
2005	168697.1
2006	170588.8
2007	172480.5
2008	174372.2
2009	176263.9
2010	178155.6
2011	180047.3
2012	181939
2013	183830.7
2014	185722.4
2015	187614.1