Year	sq. km
1990	170.7
1991	183.46
1992	196.22
1993	208.98
1994	221.74
1995	234.5
1996	247.26
1997	260.02
1998	272.78
1999	285.54
2000	298.3
2001	313.14
2002	327.98
2003	342.82
2004	357.66
2005	372.5
2006	387.34
2007	402.18
2008	417.02
2009	431.86
2010	446.7
2011	453.68
2012	460.66
2013	467.64
2014	474.62
2015	481.6
2016	486.6
2017	493.8
2018	500.4
2019	506.9
2020	513.5
2021	520.033