Year	gross (GPI)
1970	0.420399993658066
1971	0.429349988698959
1972	0.438580006361008
1973	0.446990013122559
1974	0.455480009317398
1975	0.464399993419647
1976	0.475870013237
1977	0.463910013437271
1978	0.473749995231628
1979	0.494949996471405
1980	0.50748997926712
1981	0.518040001392365
1982	0.528890013694763
1983	0.536319971084595
1984	0.540629982948303
1985	0.555379986763
1986	0.543320000171661
1987	0.544839978218079
1988	0.587379992008209
1989	0.605870008468628
1990	0.630529999732971
1991	0.650799989700317
1992	0.663580000400543
1993	0.675689995288849
1994	0.685029983520508
1995	0.693939983844757
1996	0.704330027103424
1997	0.731410026550293
1998	0.757040023803711
1999	0.783209979534149
2000	0.810890018939972
2001	0.845610022544861
2002	0.876070022583008
2003	0.921599984169006
2004	0.915050029754639
2005	0.939140021800995
2006	0.972859978675842
2007	0.962719976902008
2008	1.04083001613617
2009	1.0079300403595
2010	0.993330001831055
2011	1.00994002819061
2012	1.01213002204895
2013	0.990429997444153
2014	0.980289995670319
2015	0.9757000207901
2016	1.00879001617432
2017	1.00551998615265
2018	1.03577995300293
2019	1.04094994068146
2020	1.045529961586
2021	1.05377995967865
2022	1.06668996810913