Year	sq. km
1990	218753.3
1991	219323.61
1992	219893.92
1993	220464.23
1994	221034.54
1995	221604.85
1996	222175.16
1997	222745.47
1998	223315.78
1999	223886.09
2000	224456.4
2001	224252.76
2002	224049.12
2003	223845.48
2004	223641.84
2005	223438.2
2006	223234.56
2007	223030.92
2008	222827.28
2009	222623.64
2010	222420
2011	222754
2012	223088
2013	223422
2014	223756
2015	224090
2016	224090
2017	224090
2018	224090
2019	224090
2020	224090
2021	224090