Year	gross (GPI)
1970	0.112879998981953
1972	0.123709999024868
1974	0.117600001394749
1976	0.146170005202293
1977	0.159030005335808
1978	0.159860000014305
1979	0.158950001001358
1980	0.158429995179176
1981	0.15871000289917
1982	0.264699995517731
1983	0.223399996757507
1984	0.221039995551109
1985	0.241549998521805
1986	0.245269998908043
1987	0.23055000603199
1988	0.194399997591972
1989	0.195810005068779
1990	0.194879993796349
1999	0.478130012750626
2000	0.477140009403229
2001	0.509050011634827
2002	0.469550013542175
2003	0.470719993114471
2004	0.461540013551712
2005	0.505299985408783
2006	0.539460003376007
2007	0.541719973087311
2008	0.548430025577545
2009	0.593270003795624
2011	0.690110981464386
2012	0.718720495700836
2013	0.725362360477448
2014	0.730937719345093
2015	0.70672732591629
2016	0.688882410526276
2017	0.693138659000397
2018	0.696561813354492
2019	0.707603454589844
2020	0.799536287784576
2021	0.820628702640533
2022	0.841060400009155