Year	gross (GPI)
1973	0.738499999046326
1974	0.717279970645905
1975	0.708899974822998
1976	0.699349999427795
1977	0.709500014781952
1978	0.69011002779007
1979	0.658990025520325
1980	0.643069982528687
1981	0.605889976024628
1982	0.63264000415802
1983	0.648310005664825
1984	0.656279981136322
1985	0.641719996929169
1986	0.619140028953552
1987	0.620899975299835
1988	0.636520028114319
1989	0.659630000591278
1990	0.673529982566833
1991	0.708840012550354
1992	0.731480002403259
1993	0.752390027046204
1994	0.73879998922348
1995	0.738200008869171
1996	0.738380014896393
1997	0.771849989891052
1998	0.814369976520538
1999	0.860660016536713
2000	0.877219974994659
2001	0.856989979743958
2002	0.898220002651215
2003	0.905160009860992
2004	0.934140026569366
2005	0.942219972610474
2006	0.983919978141785
2007	1.02795994281769
2008	1.04454004764557
2009	1.06286001205444
2010	1.07513999938965
2011	1.08570003509521
2012	1.11079001426697
2013	1.12943005561829
2014	1.14512002468109
2015	1.15535998344421
2016	1.17156004905701
2017	1.17261004447937
2018	1.17665004730225
2019	1.1793999671936
2020	1.16445994377136
2021	1.1539900302887
2022	1.14213001728058