Year	gross (GPI)
1970	0.674019992351532
1971	0.71424001455307
1972	0.51705002784729
1973	0.517719984054565
1974	0.613449990749359
1975	0.600499987602234
1976	0.606320023536682
1979	0.685890018939972
1980	0.721010029315948
1981	0.745459973812103
1982	0.728070020675659
1983	0.744490027427673
1984	0.836690008640289
1985	0.881410002708435
1986	0.930400013923645
1987	0.954100012779236
1988	0.979430019855499
1989	1.02586996555328
1990	1.08290994167328
1991	1.11281001567841
1992	1.13767004013062
1993	1.15313005447388
1994	1.19277000427246
1995	1.2028900384903
1996	1.22555994987488
2013	1.30406999588013
2014	1.29576003551483
2015	1.29209005832672
2016	1.30125999450684
2017	1.31057000160217
2018	1.32513999938965
2019	1.35318994522095
2020	1.36304998397827
2021	1.38823997974396