Year	gross (GPI)
1970	0.428889989852905
1971	0.437310010194778
1972	0.445690006017685
1973	0.453379988670349
1974	0.460929989814758
1975	0.469309985637665
1976	0.48021999001503
1977	0.468039989471436
1978	0.477649986743927
1979	0.498620003461838
1980	0.510879993438721
1981	0.52113002538681
1982	0.531740009784698
1983	0.539049983024597
1984	0.543259978294373
1985	0.557919979095459
1986	0.54585999250412
1987	0.547320008277893
1988	0.589550018310547
1989	0.607919991016388
1990	0.632350027561188
1991	0.652469992637634
1992	0.665050029754639
1993	0.6769899725914
1994	0.686219990253448
1995	0.695010006427765
1996	0.70524001121521
1997	0.73241001367569
1998	0.757860004901886
1999	0.784189999103546
2000	0.811959981918335
2001	0.846700012683868
2002	0.877020001411438
2003	0.922869980335236
2004	0.916459977626801
2005	0.940209984779358
2006	0.975600004196167
2007	0.966470003128052
2008	1.04315996170044
2009	1.01212000846863
2010	0.998359978199005
2011	1.01564002037048
2012	1.01803994178772
2013	0.997550010681152
2014	0.987720012664795
2015	0.983280003070831
2016	1.01610994338989
2017	1.01319003105164
2018	1.04234004020691
2019	1.04781997203827
2020	1.05228996276855
2021	1.06036996841431
2022	1.07307994365692