Year	sq. km
1992	21903.3
1993	21804.95
1994	21706.6
1995	21608.25
1996	21509.9
1997	21411.55
1998	21313.2
1999	21214.85
2000	21116.5
2001	21107.51
2002	21098.52
2003	21089.53
2004	21080.54
2005	21071.55
2006	21062.56
2007	21053.57
2008	21044.58
2009	21035.59
2010	21026.6
2011	21142.28
2012	21257.96
2013	21373.64
2014	21489.32
2015	21605
2016	21765.1
2017	21879.1
2018	21879.1
2019	21879.1
2020	21879.1
2021	21879.1