Year	% gross
1971	39.8760299682617
1972	37.3868217468262
1973	39.3871612548828
1974	40.7209014892578
1975	41.5578918457031
1976	44.6413803100586
1977	46.2177200317383
1978	48.5246315002441
1979	51.818359375
1980	56.3144416809082
1981	58.1953582763672
1982	59.9223289489746
1983	60.5871696472168
1984	61.0416412353516
1985	61.9957084655762
1986	63.7408485412598
1987	64.6523590087891
1988	67.8625717163086
1989	69.8677597045898
1990	72.3965911865234
1991	74.5641479492188
1992	80.0115585327148
1993	84.0967483520508
1994	87.8374633789063
1995	90.7909393310547
1996	92.9453430175781
1997	95.3060607910156
1998	96.4222412109375
2013	97.1918869018555
2014	93.8320922851563
2015	92.1507873535156
2016	91.48046875
2017	92.3025665283203
2018	95.6267013549805
2019	99.7628631591797
2020	101.950012207031