Year	sq. km
1990	460.6
1991	456.22
1992	451.84
1993	447.46
1994	443.08
1995	438.7
1996	434.32
1997	429.94
1998	425.56
1999	421.18
2000	416.8
2001	412.42
2002	408.04
2003	403.66
2004	399.28
2005	394.9
2006	390.52
2007	386.14
2008	381.76
2009	377.38
2010	373
2011	368.62
2012	364.24
2013	359.86
2014	355.48
2015	351.1
2016	346.7
2017	342.3
2018	338
2019	333.6
2020	329.2
2021	324.8