Year	sq. km
1992	21415487.258
1993	21366920.362999998
1994	21318353.468000006
1995	21269786.573
1996	21221219.678
1997	21172652.783
1998	21124085.887999997
1999	21075518.99299999
2000	21026952.097999997
2001	21003139.983
2002	20979327.865999997
2003	20955515.751
2004	20931703.634999998
2005	20907891.519999996
2006	20917663.404
2007	20894305.288
2008	20870947.173
2009	20847589.055999994
2010	20824230.941
2011	20808379.374999993
2012	20792527.807
2013	20776676.24
2014	20760824.67399999
2015	20744973.106999997
2016	20742511.622
2017	20717885.573000003
2018	20709726.461999997
2019	20699281
2020	20689597.799999993
2021	20679406.42599999