Year	gross (GPI)
1970	0.784650027751923
1971	0.658749997615814
1973	0.634630024433136
1974	0.613749980926514
1975	0.572350025177002
1977	0.574440002441406
1978	0.558839976787567
1979	0.619660019874573
1981	0.768490016460419
1983	0.680180013179779
1984	0.668799996376038
1985	0.697790026664734
1986	0.708570003509521
1994	0.495429992675781
2010	1.43405866622925
2011	1.40357434749603
2012	1.36602091789246
2013	1.35023927688599
2014	1.22690629959106
2015	1.35691344738007
2016	1.36694467067719
2017	1.35345578193665
2018	1.34266352653503
2019	1.39371860027313
2020	1.39930236339569
2021	1.38233625888824
2022	1.39708495140076