Year	Square Kilometers
1990	30450
1991	30450
1992	30784
1993	30951
1994	31118
1995	31285
1996	31452
1997	31619
1998	31786
1999	31953
2000	32120
2001	32286
2002	32452
2003	32618
2004	32784
2005	32950
2006	32911
2007	32872
2008	32833
2009	32794
2010	32755
2011	32643.8
2012	32532.6
2013	32421.4
2014	32310.2
2015	32199