Year	gross (GPI)
1970	0.827880024909973
1971	0.825070023536682
1972	0.825360000133514
1973	0.821990013122559
1974	0.825980007648468
1975	0.825269997119904
1976	0.823140025138855
1977	0.835579991340637
1978	0.835150003433228
1979	0.83499002456665
1980	0.829439997673035
1981	0.814540028572083
1982	0.82668000459671
1983	0.822250008583069
1984	0.81752997636795
1985	0.818669974803925
1986	0.807510018348694
1987	0.801320016384125
1988	0.822929978370667
1989	0.830120027065277
1990	0.836910009384155
1991	0.847440004348755
1992	0.859040021896362
1993	0.869629979133606
1994	0.871110022068024
1995	0.877690017223358
1996	0.883229970932007
1997	0.900499999523163
1998	0.921720027923584
1999	0.946889996528625
2000	0.960129976272583
2001	0.967490017414093
2002	0.995180010795593
2003	0.994570016860962
2004	1.00476002693176
2005	1.02076005935669
2006	1.04489004611969
2007	1.05134999752045
2008	1.06094002723694
2009	1.06482005119324
2010	1.06644999980927
2011	1.0681300163269
2012	1.08790004253387
2013	1.10968005657196
2014	1.12019002437592
2015	1.1224000453949
2016	1.13408005237579
2017	1.13891994953156
2018	1.14805996417999
2019	1.15963995456696
2020	1.15886998176575
2021	1.15561997890472
2022	1.14225995540619