Year	sq. km
1992	31866
1993	31934
1994	32002
1995	32070
1996	32138
1997	32206
1998	32274
1999	32342
2000	32410
2001	32541.12
2002	32672.24
2003	32803.36
2004	32934.48
2005	33065.6
2006	33196.72
2007	33327.84
2008	33458.96
2009	33590.08
2010	33721.2
2011	33759.84
2012	33798.48
2013	33837.12
2014	33875.76
2015	33914.4
2016	33953.1
2017	33991.8
2018	34030.5
2019	34069.2
2020	34107.9
2021	34146.6