Year	gross (GPI)
1973	0.549189984798431
1974	0.562049984931946
1975	0.579240024089813
1976	0.585089981555939
1977	0.600570023059845
1978	0.587999999523163
1979	0.58253002166748
1980	0.574069976806641
1981	0.560109972953796
1982	0.578490018844604
1983	0.590420007705688
1984	0.603399991989136
1985	0.60878998041153
1986	0.595870018005371
1987	0.602989971637726
1988	0.620589971542358
1989	0.642220020294189
1990	0.65855997800827
1991	0.685559988021851
1992	0.714559972286224
1993	0.745859980583191
1994	0.748799979686737
1995	0.752020001411438
1996	0.753610014915466
1997	0.781130015850067
1998	0.801680028438568
1999	0.832409977912903
2000	0.846050024032593
2001	0.837459981441498
2002	0.871129989624023
2003	0.881340026855469
2004	0.907959997653961
2005	0.918619990348816
2006	0.955789983272552
2007	0.995909988880157
2008	1.01477003097534
2009	1.03475999832153
2010	1.0487699508667
2011	1.06002998352051
2012	1.08452999591827
2013	1.10355997085571
2014	1.12258005142212
2015	1.13436996936798
2016	1.15056002140045
2017	1.15234994888306
2018	1.15627002716064
2019	1.16098999977112
2020	1.14964997768402
2021	1.14204001426697
2022	1.13238000869751