Year	gross (GPI)
1970	0.703310012817383
1971	0.703830003738403
1972	0.702449977397919
1973	0.7119500041008
1974	0.72079998254776
1975	0.722800016403198
1976	0.730130016803741
1977	0.741119980812073
1978	0.754320025444031
1979	0.764630019664764
1980	0.77020001411438
1981	0.792699992656708
1982	0.816600024700165
1983	0.837930023670197
1984	0.856899976730347
1985	0.866540014743805
1986	0.883880019187927
1987	0.895139992237091
1988	0.90896999835968
1989	0.926959991455078
1990	0.943099975585938
1991	0.958310008049011
1992	0.992500007152557
1993	1.01346004009247
1994	1.02471005916595
1995	1.05806994438171
1996	1.07445001602173
1997	1.09675002098083
1998	1.1185200214386
1999	1.11265003681183
2000	1.11296999454498
2001	1.11504995822906
2002	1.12713003158569
2003	1.12901997566223
2004	1.13627004623413
2005	1.14181995391846
2006	1.14844000339508
2007	1.15272998809814
2008	1.1538200378418
2009	1.15511000156403
2010	1.15074002742767
2011	1.14997005462646
2012	1.14637005329132
2013	1.14401996135712
2014	1.14260995388031
2015	1.14526998996735
2016	1.1517299413681
2017	1.15657997131348
2018	1.16270995140076
2019	1.16472995281219
2020	1.17914998531342
2021	1.18763995170593
2022	1.18596005439758