Year	sq. km
1990	4616.4
1991	4785.12
1992	4953.84
1993	5122.56
1994	5291.28
1995	5460
1996	5628.72
1997	5797.44
1998	5966.16
1999	6134.88
2000	6303.6
2001	6393.62
2002	6483.64
2003	6573.66
2004	6663.68
2005	6753.7
2006	6843.72
2007	6933.74
2008	7023.76
2009	7113.78
2010	7203.8
2011	7272.38
2012	7340.96
2013	7409.54
2014	7478.12
2015	7546.7
2016	7623.5
2017	7700.2
2018	7740.2
2019	7780.2
2020	7820.2
2021	7860.2