Year	sq. km
1991	382.93
1992	384.36
1993	385.79
1994	387.22
1995	388.65
1996	390.08
1997	391.51
1998	392.94
1999	394.37
2000	395.8
2001	396.78
2002	397.76
2003	398.74
2004	399.72
2005	400.7
2006	401.68
2007	402.66
2008	403.64
2009	404.62
2010	405.6
2011	406.46
2012	407.32
2013	408.18
2014	409.04
2015	409.9
2016	410.8
2017	411.6
2018	412.5
2019	413.3
2020	414.1
2021	414.9