Year	gross (GPI)
1970	0.958859980106354
1973	0.959200024604797
1974	0.95362001657486
1975	0.943009972572327
1976	0.933399975299835
1977	0.941529989242554
1978	0.943470001220703
1979	0.925719976425171
1980	0.9167799949646
1981	0.891369998455048
1982	0.893750011920929
1983	0.901130020618439
1984	0.896470010280609
1985	0.879610002040863
1986	0.865220010280609
1987	0.856970012187958
1988	0.85945999622345
1989	0.865840017795563
1990	0.869239985942841
1991	0.874230027198792
1992	0.888199985027313
1993	0.902040004730225
1994	0.894569993019104
1995	0.896879971027374
1996	0.898450016975403
1997	0.922959983348846
1998	0.964730024337769
1999	0.999970018863678
2000	1.0200799703598
2001	1.01429998874664
2002	1.03882002830505
2003	1.03663003444672
2004	1.05678999423981
2005	1.06392002105713
2006	1.08379995822906
2007	1.10722994804382
2008	1.11690998077393
2009	1.12901997566223
2010	1.13275003433228
2011	1.13935005664825
2012	1.14953994750977
2013	1.15634000301361
2014	1.15655994415283
2015	1.16166996955872
2016	1.16614997386932
2017	1.16814005374908
2018	1.17346000671387
2019	1.17962002754211
2020	1.17816996574402
2021	1.17815005779266
2022	1.16655004024506