Year	% gross
1971	13.2692699432373
1972	14.8318300247192
1973	18.1963500976562
1974	21.4361591339111
1975	24.8732604980469
1976	25.8681201934814
1977	26.066089630127
1978	28.332649230957
1979	27.1744899749756
1980	26.9649105072021
1981	28.698579788208
1982	28.5538806915283
1983	29.8649806976318
1984	31.8958396911621
1985	33.4726104736328
1986	36.2248191833496
1987	35.611270904541
1988	36.8599510192871
1989	35.1849784851074
1994	36.2767486572266
1995	38.6431007385254
1996	45.6757888793945
1997	46.0969200134277
1999	44.425910949707
2001	48.6962699890137
2002	49.4960594177246
2019	67.1429977416992