Year	gross (GPI)
1970	0.453530013561249
1971	0.461760014295578
1972	0.471740007400513
1973	0.481489986181259
1974	0.488409996032715
1975	0.494599997997284
1976	0.506569981575012
1977	0.495770007371902
1978	0.503660023212433
1979	0.52837997674942
1980	0.542209982872009
1981	0.557389974594116
1982	0.562609970569611
1983	0.572319984436035
1984	0.579990029335022
1985	0.596459984779358
1986	0.587700009346008
1987	0.588630020618439
1988	0.630890011787415
1989	0.651120007038116
1990	0.678049981594086
1991	0.698689997196198
1992	0.708280026912689
1993	0.728829979896545
1994	0.736850023269653
1995	0.751450002193451
1996	0.763189971446991
1997	0.790120005607605
1998	0.827430009841919
1999	0.86133998632431
2000	0.89003998041153
2001	0.916289985179901
2002	0.942690014839172
2003	0.988499999046326
2004	0.980660021305084
2005	0.997770011425018
2006	1.03163003921509
2007	1.02407002449036
2008	1.09420001506805
2009	1.07658004760742
2010	1.06104004383087
2011	1.0660400390625
2012	1.05789995193481
2013	1.03314995765686
2014	1.02692997455597
2015	1.02874994277954
2016	1.06071996688843
2017	1.05381000041962
2018	1.08264005184174
2019	1.08587002754211
2020	1.08585000038147
2021	1.07504999637604
2022	1.08148002624512