Year	% gross
1970	13.3699998855591
1971	14.4638204574585
1972	17.341739654541
1973	17.5752792358398
1974	19.530330657959
1975	18.5111904144287
1976	18.9338207244873
1979	21.2331504821777
1980	22.0985107421875
1981	23.2901992797852
1982	23.3203907012939
1983	23.9797191619873
1984	28.9036293029785
1985	30.0716800689697
1986	34.0847816467285
1987	36.2130317687988
1988	39.5827903747559
1989	42.7181396484375
1990	40.4860801696777
1991	46.0741081237793
1992	52.6488800048828
1993	59.7650108337402
1994	64.770149230957
1995	64.5515213012695
1996	66.1616973876953
2013	95.1123275756836
2014	95.237678527832
2015	96.9223480224609
2016	97.1180801391602
2017	96.9074325561523
2018	97.6879425048828
2019	94.8604583740234
2020	93.1885223388672
2021	99.2572784423828