Year	Square Kilometers
1990	152630
1991	153201
1992	153772
1993	154343
1994	154914
1995	155485
1996	156056
1997	156627
1998	157198
1999	157769
2000	158340
2001	158756
2002	159172
2003	159588
2004	160004
2005	160420
2006	160798
2007	161176
2008	161554
2009	161932
2010	162310
2011	165318
2012	168326
2013	171334
2014	174342
2015	177350