Year	% gross
1971	23.4910202026367
1972	23.266429901123
1973	23.508430480957
1974	23.8404903411865
1975	24.8125495910645
1976	24.7891807556152
1977	24.7343406677246
1978	24.7055206298828
1979	22.2585792541504
1980	23.1145706176758
1981	23.1758098602295
1982	23.4111595153809
1983	24.9133396148682
1984	26.057689666748
1985	27.0960903167725
1986	26.7770099639893
1987	27.0802402496338
1988	27.2555999755859
1989	28.0832500457764
1990	28.9273204803467
1991	31.7959098815918
1992	34.7727088928223
2006	30.7574195861816
2007	33.1986198425293
2008	33.4576301574707
2009	32.7787208557129
2010	33.541389465332
2011	34.483528137207
2012	35.9104194641113
2013	37.0170097351074
2014	37.1180114746094
2015	39.3129997253418
2016	40.3140716552734
2017	39.7912788391113
2018	41.0583000183105
2019	42.7409400939941
2021	45.314998626709