Year	sq. km
1990	69877.8
1991	69668.29
1992	69458.78
1993	69249.27
1994	69039.76
1995	68830.25
1996	68620.74
1997	68411.23
1998	68201.72
1999	67992.21
2000	67782.7
2001	67579.9
2002	67377.1
2003	67174.3
2004	66971.5
2005	66768.7
2006	66565.9
2007	66363.1
2008	66160.3
2009	65957.5
2010	65754.7
2011	65531.42
2012	65308.14
2013	65084.86
2014	64861.58
2015	64638.3
2016	64430.5
2017	64221.1
2018	64011.6
2019	63802.1
2020	63592.6
2021	63383.1