Year	gross (GPI)
1970	0.80155998468399
1971	0.948019981384277
1972	0.760230004787445
1973	0.76120001077652
1974	0.633889973163605
1975	0.615620017051697
1976	0.629540026187897
1977	0.647149980068207
1978	0.651560008525848
1979	0.596040010452271
1980	0.629310011863708
1981	0.532660007476807
1982	0.786270022392273
1983	0.879779994487762
1984	0.912339985370636
1985	0.908110022544861
1986	0.877489984035492
1987	0.870360016822815
1988	0.866450011730194
1989	0.866110026836395
1990	0.833159983158112
1991	0.827880024909973
1992	0.850560009479523
1993	0.870670020580292
1994	0.89148998260498
1995	0.913450002670288
1996	0.937319993972778
1997	0.961660027503967
1998	0.986379981040955
1999	1.01699995994568
2000	1.03793001174927
2001	1.05269002914429
2002	1.07685005664825
2003	1.10564005374908
2004	1.10585999488831
2005	1.10767996311188
2006	1.1246600151062
2007	1.13996994495392
2008	1.1543300151825
2009	1.16638994216919
2010	1.17868995666504
2011	1.19037997722626
2012	1.20090997219086
2013	1.21482002735138
2014	1.22914004325867
2015	1.24310994148254
2016	1.25624001026154
2017	1.26959002017975
2018	1.28271996974945
2019	1.29048001766205
2020	1.28304004669189