Year	% gross
1973	3.2051899433136
1974	3.18729996681213
1975	3.44272994995117
1976	6.25178003311157
1977	12.4724502563477
1978	9.05362033843994
1979	8.60964965820313
1980	10.1710395812988
1981	13.0692701339722
1982	12.981969833374
1983	14.0417604446411
1984	15.1617002487183
1985	17.1940307617188
1986	19.4454307556152
1987	20.9182300567627
1988	22.5086193084717
1989	22.307430267334
1990	21.4404792785645
1991	21.9489192962646
1992	22.9084491729736
1993	23.7576599121094
1994	24.2985191345215
1995	25.3571701049805
1996	26.4223499298096
1997	27.7620391845703
1998	37.7633590698242
1999	40.7239303588867
2000	40.6877899169922
2001	40.7942886352539
2002	37.9077796936035
2003	37.9141883850098
2004	38.7252998352051
2005	39.9187889099121
2006	42.3869285583496
2007	44.9920883178711
2008	47.2392082214355
2009	49.9493103027344
2010	52.2776412963867
2011	57.2331199645996
2012	64.5085067749023
2013	68.598747253418
2014	71.620979309082
2015	73.9318618774414
2016	76.96484375
2017	79.1059188842773
2018	82.2336196899414
2019	82.8214874267578
2020	82.9618225097656