Year	% of land area
1992	0.8931123178050872
1993	0.92169191197485
1994	0.8573878250928837
1995	0.8216633323806801
1996	0.7716490425835952
1997	0.7573592454987139
1998	0.7359245498713919
1999	0.7287796513289512
2000	0.7287796513289512
2001	0.7144898542440697
2002	0.7144898542440697
2003	0.7002000571591883
2004	0.707344955701629
2005	0.8359531294655616
2006	1.0002857959416978
2007	0.9074021148899686
2008	0.9288368105172907
2009	0.9502715061446128
2010	0.9559874249785654
2011	0.9617033438125179
2012	0.9674192626464705
2013	0.973135181480423
2014	0.9871312668424769
2015	1.008718207363643
2016	1.0404207795950717
2017	1.3992362562144247
2018	1.4208516463722172
2019	1.4338208804668926
2020	1.4525542186036458
2021	1.4698465307298796