Year	sq. km
1990	77788.1
1991	77318.55
1992	76849
1993	76379.45
1994	75909.9
1995	75440.35
1996	74970.8
1997	74501.25
1998	74031.7
1999	73562.15
2000	73092.6
2001	72623.06
2002	72153.52
2003	71683.98
2004	71214.44
2005	70744.9
2006	70275.36
2007	69805.82
2008	69336.28
2009	68866.74
2010	68397.2
2011	68746.06
2012	69094.92
2013	69443.78
2014	69792.64
2015	70141.5
2016	70490.4
2017	70839.3
2018	71188.1
2019	71537
2020	71885.9
2021	72234.8