Year	gross (GPI)
1972	0.393799990415573
1973	0.47350001335144
1974	0.498499989509583
1975	0.491699993610382
1976	0.596719980239868
1977	0.398200005292892
1978	0.355540007352829
1979	0.275779992341995
1980	0.366230010986328
1981	0.343580007553101
1982	0.288439989089966
1983	0.296240001916885
1984	0.361140012741089
1985	0.459100008010864
1986	0.513440012931824
1987	0.554849982261658
1988	0.602880001068115
1989	0.648880004882812
1990	0.774900019168854
1991	0.824209988117218
1992	0.929539978504181
1993	0.985849976539612
1994	1.01229000091553
1995	0.993439972400665
1996	1.06586003303528
1997	1.12697005271912
1998	1.0938800573349
1999	1.11615002155304
2000	1.17745995521545
2001	1.21423995494843
2002	1.27987003326416
2003	1.28306996822357
2004	1.25217998027802
2005	1.27700996398926
2006	1.29975998401642
2007	1.30701005458832
2008	1.30598998069763
2009	1.27704000473022
2010	1.26675999164581
2011	1.26602005958557
2012	1.25562000274658
2013	1.25171005725861
2014	1.23983001708984
2015	1.28707003593445
2016	1.28380000591278
2017	1.28928005695343
2018	1.29031002521515
2019	1.31454002857208
2020	1.32176005840302
2021	1.36485004425049
2022	1.32457995414734