Year	sq. km
1990	153776.3
1991	153739.54
1992	153702.78
1993	153666.02
1994	153629.26
1995	153592.5
1996	153555.74
1997	153518.98
1998	153482.22
1999	153445.46
2000	153408.7
2001	153367.69
2002	153326.68
2003	153285.67
2004	153244.66
2005	153203.65
2006	153162.64
2007	153121.63
2008	153080.62
2009	153039.61
2010	152998.6
2011	152902.22
2012	152805.84
2013	152709.46
2014	152613.08
2015	152516.7
2016	152403.2
2017	152330.2
2018	152207.8
2019	152085.3
2020	151962.9
2021	151840.43300000002