Year	gross (GPI)
1970	0.691039979457855
1971	0.699159979820251
1972	0.709089994430542
1973	0.736869990825653
1974	0.757510006427765
1975	0.775680005550385
1976	0.780350029468536
1977	0.819019973278046
1978	0.84254002571106
1979	0.86353999376297
1980	0.879279971122742
1981	0.895349979400635
1982	0.905170023441315
1983	0.912429988384247
1984	0.922339975833893
1985	0.936789989471436
1986	0.947650015354156
1987	0.96245002746582
1988	0.982159972190857
1989	1.00177001953125
1990	1.03361999988556
1991	1.04182994365692
1992	1.0613499879837
1993	1.06693994998932
1994	1.07248997688293
1995	1.0879100561142
1996	1.09265995025635
1997	1.09815001487732
1998	1.10110998153687
1999	1.10318994522095
2000	1.10754001140594
2001	1.11773002147675
2002	1.13216996192932
2003	1.1429500579834
2004	1.15643000602722
2005	1.16686999797821
2006	1.17246997356415
2007	1.17844998836517
2008	1.18053996562958
2009	1.18247997760773
2010	1.17972004413605
2011	1.1772700548172
2012	1.17712998390198
2013	1.17982995510101
2014	1.17683005332947
2015	1.17923998832703
2016	1.17976999282837
2017	1.18719005584717
2018	1.19021999835968
2019	1.197389960289
2020	1.20895004272461
2021	1.22521996498108
2022	1.22757005691528