Year	sq. km
2006	26118
2007	26371
2008	26624
2009	26877
2010	27130
2011	27143.06
2012	27156.12
2013	27169.18
2014	27182.24
2015	27195.3
2016	27201.8
2017	27218.6
2018	27220
2019	27222.2
2020	27226.5
2021	27229.4