Year	sq. km
1990	37756.7
1991	37819.17
1992	37881.64
1993	37944.11
1994	38006.58
1995	38069.05
1996	38131.52
1997	38193.99
1998	38256.46
1999	38318.93
2000	38381.4
2001	38406.46
2002	38431.52
2003	38456.58
2004	38481.64
2005	38506.7
2006	38531.76
2007	38556.82
2008	38581.88
2009	38606.94
2010	38632
2011	38667.98
2012	38703.96
2013	38739.94
2014	38775.92
2015	38811.9
2016	38847.9
2017	38883.8
2018	38919.7
2019	38955.6
2020	38991.5
2021	39027.4