Year	gross (GPI)
1970	0.495539993047714
1971	1.16649997234344
1972	0.577509999275208
1973	0.672060012817383
1974	0.403640002012253
1975	0.414719998836517
1985	0.620400011539459
1986	0.540120005607605
2003	1.15539002418518
2004	1.15328001976013
2005	1.15249001979828
2019	1.30880999565125