Year	sq. km
1990	25449.1
1991	25441.79
1992	25434.48
1993	25427.17
1994	25419.86
1995	25412.55
1996	25405.24
1997	25397.93
1998	25390.62
1999	25383.31
2000	25376
2001	25368.68
2002	25361.36
2003	25354.04
2004	25346.72
2005	25339.4
2006	25332.08
2007	25324.76
2008	25317.44
2009	25310.12
2010	25302.8
2011	25295.48
2012	25288.16
2013	25280.84
2014	25273.52
2015	25266.2
2016	25258.9
2017	25251.6
2018	25244.3
2019	25237
2020	25229.7
2021	25222.4