Year	% gross
1970	8.32892036437988
1971	8.70919036865234
1972	9.05331039428711
1973	9.44694042205811
1974	9.89943027496338
1975	10.7038602828979
1976	11.9821500778198
1977	13.0622100830078
1978	13.9873695373535
1979	15.6135997772217
1980	16.7709407806396
1981	18.928689956665
1982	21.8224601745605
1983	24.1110801696777
1984	26.8612594604492
1985	28.6605701446533
1986	31.157169342041
1987	38.6593399047852
1988	39.1526489257813
1989	39.6220092773438
1990	43.4022598266602
1991	41.5282096862793
1992	43.6308784484863
1993	45.4277114868164
1994	46.2520904541016
1995	48.1056518554688
1996	49.7450714111328
1997	50.7664604187012
1998	52.2062110900879
1999	53.8285293579102
2000	54.9869194030762
2001	55.7402687072754
2002	56.0927085876465
2003	57.2235107421875
2004	58.3772506713867
2005	60.5098190307617
2006	62.7835502624512
2007	64.4715728759766
2008	66.3999099731445
2009	66.9426422119141
2010	73.3158416748047
2011	75.5735168457031
2012	76.1586532592773
2013	70.2333908081055
2014	72.3131484985352
2015	73.0599517822266
2016	74.7261505126953
2017	75.9604034423828
2018	76.4965591430664
2019	76.6839981079102
2020	75.7343215942383