Year	gross (GPI)
1970	0.609640002250671
1971	0.604420006275177
1972	0.651160001754761
1973	0.665840029716492
1974	0.689100027084351
1975	0.706089973449707
1976	0.701399981975555
1977	0.711009979248047
1978	0.728429973125458
1979	0.740100026130676
1980	0.754909992218018
1981	0.774999976158142
1982	0.796109974384308
1983	0.828100025653839
1984	0.838050007820129
1985	0.855379998683929
1986	0.86735999584198
1987	0.9098100066185
1988	0.910369992256165
1989	0.939350008964539
1990	0.96477997303009
1991	0.976549983024597
1992	0.99779999256134
1993	1.02576994895935
1994	1.04707002639771
1995	1.07156002521515
1996	1.09722995758057
1997	1.12132000923157
1998	1.12706005573273
1999	1.14595997333527
2000	1.15488994121552
2001	1.15057003498077
2002	1.15806996822357
2003	1.16492998600006
2004	1.16894996166229
2005	1.17281997203827
2006	1.19199001789093
2007	1.20666003227234
2008	1.20948994159698
2009	1.22423005104065
2010	1.22240996360779
2011	1.22437000274658
2012	1.22511994838715
2013	1.22662997245789
2014	1.22793996334076
2015	1.22537004947662
2016	1.22783005237579
2017	1.23128998279572
2018	1.235759973526
2019	1.24175000190735
2020	1.25970995426178
2021	1.28006994724274
2022	1.27690994739532