Year	gross (GPI)
1970	0.657299995422363
1971	0.661440014839172
1972	0.672749996185303
1973	0.703779995441437
1974	0.727970004081726
1975	0.749660015106201
1976	0.757359981536865
1977	0.797710001468658
1978	0.820909976959229
1979	0.843699991703033
1980	0.861349999904633
1981	0.878830015659332
1982	0.888750016689301
1983	0.897899985313416
1984	0.909189999103546
1985	0.924179971218109
1986	0.936959981918335
1987	0.952730000019073
1988	0.973420023918152
1989	0.99481999874115
1990	1.03003001213074
1991	1.0373500585556
1992	1.05718004703522
1993	1.06449997425079
1994	1.07282996177673
1995	1.09209001064301
1996	1.10132002830505
1997	1.1104199886322
1998	1.11649000644684
1999	1.12205004692078
2000	1.12861001491547
2001	1.13829004764557
2002	1.15064001083374
2003	1.15876996517181
2004	1.16846001148224
2005	1.17653000354767
2006	1.1835800409317
2007	1.18889999389648
2008	1.1947900056839
2009	1.20024001598358
2010	1.19957995414734
2011	1.19676995277405
2012	1.19395995140076
2013	1.19166994094849
2014	1.18931996822357
2015	1.19105005264282
2016	1.19551002979279
2017	1.20086002349854
2018	1.20604002475739
2019	1.21164000034332
2020	1.21938002109528
2021	1.22960996627808
2022	1.22987997531891