Year	gross (GPI)
1970	0.56155002117157
1971	0.564949989318848
1972	0.555350005626678
1973	0.553489983081818
1974	0.555159986019135
1975	0.556729972362518
1976	0.563210010528564
1977	0.538359999656677
1978	0.538980007171631
1979	0.561600029468536
1980	0.572200000286102
1981	0.581269979476929
1982	0.587759971618652
1983	0.597190022468567
1984	0.603229999542236
1985	0.621529996395111
1986	0.608609974384308
1987	0.609529972076416
1988	0.660589993000031
1989	0.68629002571106
1990	0.718309998512268
1991	0.746810019016266
1992	0.752960026264191
1993	0.771549999713898
1994	0.772310018539429
1995	0.785809993743896
1996	0.798039972782135
1997	0.809469997882843
1998	0.836340010166168
1999	0.859510004520416
2000	0.886399984359741
2001	0.90310001373291
2002	0.925840020179749
2003	0.965789973735809
2004	0.948599994182587
2005	0.973339974880219
2006	1.01127994060516
2007	0.979560017585754
2008	1.05929005146027
2009	1.06321001052856
2010	1.06454002857208
2011	1.06391000747681
2012	1.05191004276276
2013	1.04290997982025
2014	1.04778003692627
2015	1.0687700510025
2016	1.10001003742218
2017	1.08685994148254
2018	1.10760998725891
2019	1.09736001491547
2020	1.08700001239777
2021	1.07459998130798
2022	1.08343005180359