Year	gross (GPI)
1970	0.283360004425049
1971	0.284940004348755
1972	0.286080002784729
1973	0.285569995641708
1974	0.294050008058548
1975	0.307379990816116
1976	0.319160014390945
1977	0.343059986829758
1978	0.346520006656647
1979	0.359750002622604
1980	0.357950001955032
1981	0.369219988584518
1982	0.401279985904694
1983	0.394639998674393
1984	0.393739998340607
1985	0.4200100004673
1986	0.430860012769699
1987	0.430480003356934
1988	0.457080006599426
1989	0.464179992675781
1990	0.477209985256195
1991	0.487809985876083
1992	0.494340002536774
1993	0.504570007324219
1994	0.515179991722107
1995	0.527769982814789
1996	0.570169985294342
1997	0.582819998264313
1998	0.603330016136169
1999	0.623059988021851
2000	0.639039993286133
2001	0.663699984550476
2002	0.673569977283478
2003	0.661679983139038
2004	0.65777999162674
2005	0.69896000623703
2006	0.711939990520477
2007	0.69352000951767
2008	0.695930004119873
2009	0.701950013637543
2010	0.726490020751953
2011	0.777289986610413
2012	0.841939985752106
2013	0.909200012683868
2014	0.951070010662079
2015	0.94650000333786
2016	0.951759994029999
2017	0.973439991474152
2018	0.994859993457794
2019	1.03216004371643
2020	1.0464700460434
2021	1.03281998634338
2022	1.00817000865936