Year	sq. km
1990	82825
1991	82057.5
1992	81290
1993	80522.5
1994	79755
1995	78987.5
1996	78220
1997	77452.5
1998	76685
1999	75917.5
2000	75150
2001	74382.5
2002	73615
2003	72847.5
2004	72080
2005	71312.5
2006	70545
2007	69777.5
2008	69010
2009	68242.5
2010	67475
2011	66707.5
2012	65940
2013	65172.5
2014	64405
2015	63637.5
2016	62870
2017	62102.5
2018	61335
2019	60567.5
2020	59800
2021	59032.5