Year	gross (GPI)
1970	1.13827002048492
1971	1.12288999557495
1972	1.1263200044632
1973	1.12706995010376
1974	1.12861001491547
1975	1.12258994579315
1976	1.12205004692078
1977	1.13499999046326
1978	1.15599000453949
1979	1.16990995407104
1980	1.17960000038147
1981	1.18444001674652
1982	1.18580996990204
1983	1.18952000141144
1984	1.19319999217987
1985	1.18937003612518
1986	1.19028997421265
1987	1.18118000030518
1988	1.16914999485016
1989	1.15420997142792
1990	1.13283002376556
1991	1.10897994041443
1992	1.09914994239807
1993	1.09393000602722
1994	1.09381997585297
1995	1.09792995452881
1996	1.08422005176544
1997	1.07151997089386
1998	1.09676003456116
1999	1.10570001602173
2000	1.11518001556396
2001	1.12805998325348
2002	1.15474998950958
2003	1.14198994636536
2004	1.1603000164032
2005	1.16335999965668
2006	1.16061997413635
2007	1.15820002555847
2008	1.16428995132446
2009	1.1611499786377
2010	1.14910995960236
2011	1.13881003856659
2012	1.10699999332428
2013	1.09098994731903
2014	1.07035994529724
2015	1.06431996822357
2016	1.0461699962616
2017	1.04102003574371
2018	1.04167997837067
2019	1.05699002742767
2020	1.06612002849579
2021	1.08080005645752
2022	1.08247005939484