Year	% gross
1970	9.82075977325439
1971	9.79193019866943
1972	10.1827697753906
1973	11.4144697189331
1974	12.44873046875
1975	13.0872602462769
1976	13.1598596572876
1977	14.7176399230957
1979	16.2184391021729
1980	17.6800994873047
1981	20.3533496856689
1982	20.6978302001953
1983	21.3464794158936
1984	21.9917907714844
1985	22.7693195343018
1986	26.0462799072266
1987	27.0782508850098
1988	28.5871696472168
1989	29.6475601196289
1990	29.8408393859863
1991	31.2568397521973
1992	30.7541999816895
1993	27.4281101226807
1994	26.2851390838623
1995	26.6976203918457
1996	25.3470897674561
1997	25.3689193725586
1999	37.9385108947754
2000	33.3326187133789
2001	29.8303699493408
2002	30.157190322876
2003	30.2261905670166
2004	32.0726013183594
2005	32.374210357666
2006	33.8254699707031
2016	73.330192565918
2017	71.2465515136719