Year	% gross
1972	9.76274967193604
1973	9.73433017730713
1974	9.83701038360596
1975	10.3070201873779
1976	12.033579826355
1977	15.4417495727539
1978	14.2505102157593
1979	14.5177698135376
1980	15.6462802886963
1981	17.028959274292
1982	17.4394092559814
1983	18.2783393859863
1984	19.110200881958
1985	20.0973606109619
1986	21.5089302062988
1987	22.9702606201172
1988	23.6504497528076
1989	23.551549911499
1990	23.426700592041
1991	23.4624004364014
1992	23.6478099822998
1993	23.7238502502441
1994	23.5813999176025
1995	24.0656700134277
1996	24.5421295166016
1997	23.063289642334
1998	25.9395008087158
1999	26.4768905639648
2000	27.4863204956055
2001	28.1755504608154
2002	28.0988101959229
2003	29.13623046875
2004	30.7124404907227
2005	32.4366912841797
2006	34.9668197631836
2007	36.5073509216309
2008	38.364631652832
2009	40.116340637207
2010	42.2269096374512
2011	45.1938285827637
2012	48.5008506774902
2013	50.6493988037109
2014	50.8802299499512
2015	52.6262016296387
2016	54.3333511352539
2017	56.1684303283691
2018	57.1609687805176
2019	57.943229675293
2020	57.7465209960938