Year	gross (GPI)
1970	0.544780015945435
1971	0.586149990558624
1972	0.637070000171661
1973	0.653710007667542
1974	0.67849999666214
1975	0.696479976177216
1976	0.691290020942688
1977	0.698790013790131
1978	0.713299989700317
1979	0.722360014915466
1980	0.736549973487854
1981	0.755289971828461
1982	0.772369980812073
1983	0.795549988746643
1984	0.806140005588531
1985	0.823610007762909
1986	0.836009979248047
1987	0.8783900141716
1988	0.879100024700165
1989	0.90829998254776
1990	0.934849977493286
1991	0.948159992694855
1992	0.970499992370605
1993	1.00220000743866
1994	1.02757000923157
1995	1.05461001396179
1996	1.08255994319916
1997	1.1090099811554
1998	1.11589002609253
1999	1.13901996612549
2000	1.14835000038147
2001	1.14503002166748
2002	1.15216994285583
2003	1.1586799621582
2004	1.15687000751495
2005	1.16061997413635
2006	1.18084001541138
2007	1.19059002399445
2008	1.19693005084991
2009	1.21326005458832
2010	1.21393001079559
2011	1.21757996082306
2012	1.22099995613098
2013	1.22239005565643
2014	1.22531998157501
2015	1.22370994091034
2016	1.22642004489899
2017	1.22844994068146
2018	1.23341000080109
2019	1.23906004428864
2020	1.25662004947662
2021	1.27717995643616
2022	1.27399003505707