Year	gross (GPI)
1970	1.12310004234314
1971	1.10933005809784
1972	1.1120799779892
1973	1.11482000350952
1974	1.12071001529694
1975	1.1168600320816
1976	1.11881995201111
1977	1.1316100358963
1978	1.15041995048523
1979	1.16311001777649
1980	1.17279994487762
1981	1.177610039711
1982	1.17982995510101
1983	1.18306994438171
1984	1.18771994113922
1985	1.18500995635986
1986	1.18710005283356
1987	1.17911994457245
1988	1.16797995567322
1989	1.15479004383087
1990	1.13909995555878
1991	1.11162996292114
1992	1.10266995429993
1993	1.09771001338959
1994	1.10164999961853
1995	1.11052000522614
1996	1.10557997226715
1997	1.0976300239563
1998	1.11257994174957
1999	1.1239800453186
2000	1.13566994667053
2001	1.15050995349884
2002	1.17312002182007
2003	1.16149997711182
2004	1.17656004428864
2005	1.17876994609833
2006	1.17719995975494
2007	1.17580997943878
2008	1.1826399564743
2009	1.18129003047943
2010	1.17586994171143
2011	1.16852998733521
2012	1.13880002498627
2013	1.12365996837616
2014	1.10311996936798
2015	1.09099996089935
2016	1.07879996299744
2017	1.07297003269196
2018	1.07344996929169
2019	1.0869699716568
2020	1.08938002586365
2021	1.10587000846863
2022	1.10583996772766