Year	% gross
1970	3.92844009399414
1971	4.02627992630005
1972	4.06670999526978
1973	4.18142986297607
1974	4.53383016586304
1975	4.53725004196167
1976	4.4894700050354
1977	4.69551992416382
1978	4.74706983566284
1979	4.74256992340088
1981	4.25159978866577
1982	4.23919010162354
1983	4.22997999191284
1985	4.42520999908447
1986	4.44805002212524
1987	4.62093019485474
1988	4.83549976348877
1989	5.07315015792847
1991	5.93824005126953
1992	5.95737981796265
1993	6.00220012664795
1994	5.77855014801025
1995	5.60158014297485
1996	5.40397977828979
1997	6.22690010070801
2010	38.7426300048828
2014	32.8891983032227
2015	28.1546497344971
2016	26.6458396911621
2017	26.6233406066895
2018	27.9907398223877
2019	28.9306697845459
2020	29.2951698303223
2021	26.9020900726318