Year	gross (GPI)
1971	0.254409998655319
1972	0.273889988660812
1973	0.262939989566803
1974	0.278219997882843
1975	0.304569989442825
1976	0.345829993486404
1977	0.328869998455048
1978	0.370180010795593
1979	0.376269996166229
1980	0.415369987487793
1981	0.423009991645813
1982	0.493389993906021
1983	0.476660013198853
1984	0.506110012531281
1985	0.514119982719421
1986	0.547829985618591
1987	0.561940014362335
1988	0.559960007667542
1989	0.558820009231567
1990	0.636900007724762
1991	0.647260010242462
1992	0.667400002479553
1993	0.702459990978241
1994	0.709429979324341
1995	0.716520011425018
2002	0.853569984436035
2003	0.879869997501373
2004	0.838630020618439
2005	0.883490025997162
2006	0.9028400182724
2007	0.858200013637543
2008	0.881139993667603
2009	0.912190020084381
2010	0.857879996299744
2011	0.987540006637573
2012	0.973680019378662
2013	0.994059979915619
2014	1.03698003292084
2015	1.11554002761841
2016	1.15164005756378