Year	gross (GPI)
1970	0.478909999132156
1971	0.473919987678528
1972	0.463930010795593
1973	0.46068999171257
1974	0.444680005311966
1975	0.457610011100769
1976	0.472689986228943
1977	0.478309988975525
1978	0.491970002651215
1979	0.469220012426376
1980	0.479979991912842
1981	0.487049996852875
1982	0.517899990081787
1983	0.486110001802444
1984	0.478769987821579
1985	0.487729996442795
1986	0.482969999313354
1987	0.508260011672974
1988	0.497440010309219
1989	0.494170010089874
1990	0.494340002536774
1991	0.492260009050369
1992	0.497449994087219
1993	0.520489990711212
1994	0.528550028800964
1995	0.544160008430481
1996	0.56334000825882
1997	0.586000025272369
1998	0.605220019817352
1999	0.630240023136139
2000	0.651350021362305
2001	0.664240002632141
2002	0.663619995117188
2003	0.65855997800827
2004	0.661800026893616
2005	0.68189001083374
2006	0.689599990844727
2007	0.679910004138947
2008	0.681320011615753
2009	0.691370010375977
2010	0.695280015468597
2011	0.709760010242462
2012	0.725809991359711
2013	0.734099984169006
2014	0.736360013484955
2015	0.74906998872757
2016	0.752009987831116
2017	0.760919988155365
2018	0.772119998931885
2019	0.784690022468567
2020	0.808889985084534
2021	0.823610007762909
2022	0.836210012435913