Year	gross (GPI)
1970	0.800170004367828
1971	0.797309994697571
1972	0.796999990940094
1973	0.793889999389648
1974	0.79628998041153
1975	0.797290027141571
1976	0.795660018920898
1977	0.805819988250732
1978	0.8055499792099
1979	0.800440013408661
1980	0.795469999313354
1981	0.782239973545074
1982	0.794340014457703
1983	0.787490010261536
1984	0.782689988613129
1985	0.784089982509613
1986	0.774070024490356
1987	0.771040022373199
1988	0.787440001964569
1989	0.793009996414185
1990	0.799000024795532
1991	0.80783998966217
1992	0.818289995193481
1993	0.829169988632202
1994	0.832889974117279
1995	0.841319978237152
1996	0.84935998916626
1997	0.867699980735779
1998	0.889299988746643
1999	0.914879977703094
2000	0.927850008010864
2001	0.934329986572266
2002	0.959510028362274
2003	0.95906001329422
2004	0.968810021877289
2005	0.984089970588684
2006	1.007120013237
2007	1.01230001449585
2008	1.02085995674133
2009	1.0236200094223
2010	1.02438998222351
2011	1.02610003948212
2012	1.04542994499207
2013	1.06552994251251
2014	1.0771199464798
2015	1.07746005058289
2016	1.08746004104614
2017	1.09130001068115
2018	1.09961998462677
2019	1.11101996898651
2020	1.11161994934082
2021	1.10968995094299
2022	1.09807002544403