Year	gross (GPI)
1973	0.416229993104935
1974	0.419039994478226
1975	0.495590001344681
1978	0.480670005083084
1982	0.623780012130737
1983	0.748399972915649
1984	0.772639989852905
1985	0.763809978961945
1986	0.744840025901794
1994	0.963329970836639
1995	1.00039994716644
1996	0.985010027885437
1998	1.15491998195648
1999	1.1482800245285
2000	1.11302995681763
2001	1.10398995876312
2002	1.0997200012207
2003	1.08200001716614
2004	1.09693002700806
2005	1.10359001159668
2006	1.10095000267029
2007	1.10760998725891
2008	1.11340999603271
2009	1.12139999866486
2010	1.13122999668121
2011	1.12766003608704
2012	1.12958002090454
2013	1.14338004589081
2014	1.15480005741119
2015	1.1632399559021
2016	1.17157995700836
2017	1.16811001300812
2018	1.17618000507355
2019	1.18465995788574
2020	1.1861799955368