Year	% gross
1971	45.7769508361816
1972	47.6787109375
1973	49.3674812316895
1974	50.5228805541992
1975	53.1916618347168
1976	53.8084983825684
1977	55.8024787902832
1978	60.8663902282715
1979	67.1092300415039
1980	70.0136184692383
1981	72.1167297363281
1982	70.0579071044922
1983	66.8662261962891
1984	64.5929412841797
1985	64.2662963867188
1986	64.0632781982422
1987	65.7642822265625
1988	71.7273635864258
1989	79.2874221801758
1990	83.7226028442383
1991	85.8976898193359
1992	85.2885894775391
1994	78.5060195922852
1995	78.1334609985352
1996	79.6903305053711
1997	79.6976089477539
1998	78.6023788452148
1999	78.6102676391602
2000	78.8629302978516
2001	78.1261978149414
2002	79.1181182861328
2003	80.6806869506836
2004	84.0113983154297
2005	85.8980026245117
2006	87.6616668701172
2007	87.3990478515625
2008	84.9717407226563
2009	83.839729309082
2010	84.3424987792969
2011	86.9510116577148
2012	87.5761413574219
2013	87.2913970947266
2014	84.6625366210938
2015	79.8426818847656
2016	80.0384292602539
2017	80.7609634399414
2018	84.2985992431641
2019	87.9627380371094
2020	89.7464828491211