Year	% gross
1971	12.5335597991943
1972	14.6718997955322
1973	15.3676795959473
1974	14.7705898284912
1975	19.0789604187012
1976	30.1724605560303
1977	31.8141803741455
1978	33.6555595397949
1979	38.707691192627
1980	45.3168907165527
1981	51.4409217834473
1982	54.992618560791
1983	57.8089981079102
1984	61.4397315979004
1985	64.0992889404297
1986	65.9205474853516
1987	55.6666488647461
1988	52.3447685241699
1989	52.305549621582
1990	54.3731384277344
1991	58.6791305541992
1992	62.544921875
1993	67.4532928466797
1994	73.8205413818359
1995	78.7071228027344
1997	67.7566909790039
1998	62.6287002563477
2016	81.5097885131836
2017	105.197357177734
2019	120.530738830566
2020	120.353652954102