Year	Square Kilometers
1990	1320
1991	1341
1992	1362
1993	1383
1994	1404
1995	1425
1996	1446
1997	1467
1998	1488
1999	1509
2000	1530
2001	1534
2002	1538
2003	1542
2004	1546
2005	1550
2006	1548
2007	1546
2008	1544
2009	1542
2010	1540
2011	1562
2012	1584
2013	1606
2014	1628
2015	1650