Year	sq. km
1992	31611.81
1993	31606.491
1994	31601.172000000002
1995	31595.853
1996	31590.534
1997	31585.215
1998	31579.896
1999	31574.577
2000	31569.257999999998
2001	31494.512000000002
2002	31419.765
2003	31345.019
2004	31270.272999999997
2005	31195.527000000002
2006	31120.78
2007	31046.034
2008	30971.287999999997
2009	30896.541
2010	30821.795
2011	31274.349
2012	31726.902000000002
2013	32179.455
2014	32632.009
2015	33084.562000000005
2016	33377.1
2017	33669.6
2018	33962.012
2019	34254.4
2020	34546.8
2021	34839.192