Year	sq. km
1990	410.7
1991	411.56
1992	412.42
1993	413.28
1994	414.14
1995	415
1996	415.86
1997	416.72
1998	417.58
1999	418.44
2000	419.3
2001	415.76
2002	412.22
2003	408.68
2004	405.14
2005	401.6
2006	398.06
2007	394.52
2008	390.98
2009	387.44
2010	383.9
2011	383.72
2012	383.54
2013	383.36
2014	383.18
2015	383
2016	382.9
2017	386.5
2018	386.9
2019	387.3
2020	387.7
2021	388.1