Year	% gross
1970	20.6319904327393
1971	21.5767593383789
1972	22.5235595703125
1973	23.7557106018066
1975	45.9916801452637
1976	48.4494285583496
1977	48.7080917358398
1978	48.5120811462402
1980	50.9930114746094
1981	52.7594604492188
1982	57.6537208557129
1984	62.5585708618164
1985	62.6866912841797
1986	62.8861503601074
1987	61.1729507446289
1988	60.9137115478516
2010	107.728073120117
2011	107.908828735352
2012	106.584197998047
2013	103.866638183594
2014	92.1184616088867
2015	92.5329284667969
2016	92.0048599243164
2017	101.831932067871
2018	93.1427383422852
2019	90.6671829223633
2020	91.255729675293