Year	Square Kilometers
1990	31180
1991	30984
1992	30788
1993	30592
1994	30396
1995	30200
1996	30004
1997	29808
1998	29612
1999	29416
2000	29220
2001	29024
2002	28828
2003	28632
2004	28436
2005	28240
2006	28044
2007	27848
2008	27652
2009	27456
2010	27260
2011	27896
2012	28532
2013	29168
2014	29804
2015	30440