Year	gross (GPI)
1972	0.808629989624023
1973	0.804040014743805
1974	0.804589986801147
1975	0.8507000207901
1976	0.869449973106384
1977	0.872229993343353
1978	0.875789999961853
1979	0.877489984035492
1980	0.87652999162674
1981	0.869189977645874
1982	0.864629983901978
1983	0.865440011024475
1984	0.87024998664856
1985	0.866299986839294
1986	0.889090001583099
1987	0.898909986019135
1988	0.905740022659302
1989	0.913100004196167
1990	0.919770002365112
1991	0.925650000572205
1992	0.933539986610413
1993	0.936590015888214
1994	0.946889996528625
1995	0.954069972038269
1996	0.959309995174408
1997	0.962679982185364
1998	0.967989981174469
1999	0.971979975700378
2000	0.975069999694824
2001	0.977349996566772
2002	0.978290021419525
2003	0.981599986553192
2004	0.987150013446808
2005	0.991729974746704
2006	0.995069980621338
2007	0.999019980430603
2008	1.00232005119324
2009	1.00670003890991
2010	0.996640026569366
2011	0.998059988021851
2012	1
2013	1.00531995296478
2014	1.00910997390747
2015	1.00541996955872
2016	1.00765001773834
2017	1.00621998310089
2018	1.00756001472473
2019	1.00759994983673
2020	1.00617003440857