Year	% gross
1974	3.40439009666443
1975	3.78246998786926
1976	4.78368997573853
1977	6.06630992889404
1978	6.81825017929077
1980	7.18369007110596
1981	8.32647037506104
1982	8.82954978942871
1983	8.92875003814697
1984	9.04214000701904
1985	9.02783966064453
1987	8.75424957275391
1988	9.76286029815674
1989	9.64723968505859
1990	9.1099796295166
1991	8.9874095916748
1992	9.17965030670166
1993	8.85939025878906
1994	9.65291023254395
1995	9.50160026550293
1996	10.0765104293823
1997	10.7589502334595
1998	12.3728199005127
1999	12.1111297607422
2000	12.5594596862793
2003	15.5420999526978
2004	15.6347904205322
2008	17.4211807250977
2010	19.174560546875
2012	18.8540897369385
2013	19.3874206542969
2014	19.6584796905518
2015	20.2654304504395
2016	20.9513092041016
2017	24.4584407806396
2018	26.2141990661621
2019	25.126579284668