Year	gross (GPI)
1971	0.195899993181229
1972	0.194769993424416
1973	0.182820007205009
1974	0.209560006856918
1975	0.223199993371964
1976	0.225219994783401
1977	0.245429992675781
1978	0.255059987306595
1979	0.323740005493164
1986	0.470699995756149
1987	0.494309991598129
1988	0.498690009117126
1989	0.531140029430389
1990	0.581139981746674
1991	0.556999981403351
1992	0.592880010604858
1993	0.619960010051727
1994	0.643989980220795
1995	0.669550001621246
1997	0.677730023860931
1998	0.709619998931885
1999	0.710399985313416
2000	0.724150002002716
2001	0.752879977226257
2002	0.776239991188049
2003	0.778320014476776
2004	0.835309982299805
2005	0.812590003013611
2006	0.888970017433167
2007	0.915229976177216
2008	0.966620028018951
2009	0.905189990997314
2010	0.9269899725914
2011	0.945150017738342
2012	0.939320027828217
2013	0.961319983005524
2014	0.963259994983673
2015	0.947229981422424
2016	0.910950005054474
2017	0.955869972705841
2018	0.972220003604889
2019	1.01232004165649
2020	1.03974997997284
2021	1.09154999256134
2022	1.11842000484467