Year	gross (GPI)
1970	0.790000021457672
1971	0.787639975547791
1972	0.787649989128113
1973	0.781650006771088
1974	0.78030002117157
1975	0.779179990291595
1976	0.776440024375916
1977	0.785820007324219
1978	0.786369979381561
1979	0.782890021800995
1980	0.77836000919342
1981	0.766480028629303
1982	0.780380010604858
1983	0.775020003318787
1984	0.770659983158112
1985	0.77250999212265
1986	0.762530028820038
1987	0.755689978599548
1988	0.773270010948181
1989	0.778739988803864
1990	0.783050000667572
1991	0.792429983615875
1992	0.802529990673065
1993	0.812250018119812
1994	0.814109981060028
1995	0.820599973201752
1996	0.826460003852844
1997	0.843760013580322
1998	0.867919981479645
1999	0.892490029335022
2000	0.904839992523193
2001	0.91158002614975
2002	0.939790010452271
2003	0.940810024738312
2004	0.952199995517731
2005	0.96722000837326
2006	0.990109980106354
2007	0.995389997959137
2008	1.00188004970551
2009	1.00520002841949
2010	1.00539004802704
2011	1.00786995887756
2012	1.0290299654007
2013	1.05094003677368
2014	1.06450998783112
2015	1.06582999229431
2016	1.07607996463776
2017	1.08059000968933
2018	1.08931005001068
2019	1.10179996490479
2020	1.10336005687714
2021	1.10131001472473
2022	1.08975005149841