Year	Square Kilometers
1990	20580
1991	20957
1992	21334
1993	21711
1994	22088
1995	22465
1996	22842
1997	23219
1998	23596
1999	23973
2000	24350
2001	24874
2002	25398
2003	25922
2004	26446
2005	26970
2006	27440
2007	27910
2008	28380
2009	28850
2010	29320
2011	29856
2012	30392
2013	30928
2014	31464
2015	32000