Year	% gross
1971	37.1079292297363
1972	40.461109161377
1973	41.70751953125
1974	43.4811782836914
1975	44.3889198303223
1976	45.5964088439941
1977	51.1509208679199
1978	50.8765487670898
1979	51.9030609130859
1980	50.4559898376465
1981	50.5761413574219
1982	51.1251907348633
1983	53.1188812255859
1984	53.3360786437988
1985	52.2057189941406
1986	51.387279510498
1987	51.8763999938965
1988	51.8358001708984
1989	53.4544715881348
1990	51.8930206298828
1996	60.2914390563965
1998	68.2319183349609
1999	72.7632369995117
2000	79.8857879638672
2001	80.462158203125
2002	80.7692337036133
2003	83.3935089111328
2004	84.5073699951172
2005	87.8339996337891
2006	84.2444381713867
2007	85.6444091796875
2008	85.6156005859375
2009	86.3388595581055
2010	87.0753479003906
2011	89.9812164306641
2012	90.1738510131836
2013	92.9456329345703
2014	96.0021820068359
2015	92.4795303344727
2016	93.0336608886719
2017	90.4811477661133
2018	91.0167770385742
2019	94.9366302490234
2020	90.465202331543