Year	gross (GPI)
1970	0.790449976921082
1971	0.816049993038177
1972	0.806670010089874
2004	1.21586000919342
2011	1.23567998409271
2012	1.23212003707886
2013	1.21132004261017
2014	1.21601998806
2015	1.25069999694824
2016	1.20138001441956
2017	1.21380996704102
2018	1.18073999881744
2019	1.18592000007629