Year	gross (GPI)
1970	0.596379995346069
1971	0.6110600233078
1972	0.625159978866577
1973	0.638840019702911
1974	0.641319990158081
1975	0.64012998342514
1976	0.642790019512177
1977	0.670130014419556
1978	0.691659986972809
1979	0.694679975509644
1980	0.697950005531311
1981	0.706300020217896
1982	0.70727002620697
1983	0.680779993534088
1984	0.66755998134613
1985	0.705579996109009
1986	0.737380027770996
1987	0.745320022106171
1988	0.719139993190765
1989	0.755519986152649
1990	0.732379972934723
1991	0.743780016899109
1992	0.756619989871979
1993	0.754540026187897
1994	0.762160003185272
1995	0.771430015563965
1996	0.781799972057343
1997	0.782570004463196
1998	0.780179977416992
1999	0.780910015106201
2000	0.785109996795654
2001	0.793510019779205
2002	0.783909976482391
2003	0.796829998493195
2004	0.804750025272369
2005	0.815079987049103
2006	0.824850022792816
2007	0.834029972553253
2008	0.844940006732941
2009	0.855729997158051
2010	0.866590023040771
2011	0.878170013427734
2012	0.905340015888214
2013	0.9096599817276
2014	0.913039982318878
2015	0.9166100025177
2016	0.909860014915466
2017	0.923009991645813
2018	0.935490012168884
2019	0.934909999370575