Year	% gross
1974	38.9853096008301
1975	43.3030815124512
1976	49.3380813598633
1977	52.5186004638672
1978	52.4129104614258
1979	55.4725685119629
1980	54.6883888244629
1981	51.9880294799805
1982	54.1848793029785
1983	56.6818695068359
1984	55.3902702331543
1985	54.373348236084
1986	55.5263786315918
1987	53.8055610656738
1988	57.0541687011719
1989	56.8944816589355
1990	57.5395088195801
1991	58.8199310302734
1992	60.8139190673828
1993	64.0802536010742
1994	66.2486724853516
1995	67.0993423461914
1996	68.5066909790039
1997	68.9295883178711
1998	69.6196899414063
1999	70.3537368774414
2000	73.1980514526367
2001	71.8674163818359
2002	74.9916763305664
2003	74.8299789428711
2004	81.4605102539063
2005	83.6018676757813
2006	82.223762512207
2007	80.6112365722656
2008	80.1311264038086
2009	82.7818222045898
2010	80.9628829956055
2011	82.0699081420898
2012	83.7533569335938
2013	87.8698120117188
2014	78.0181121826172
2015	80.8561172485352
2016	77.1819686889648
2017	77.9193267822266
2018	76.3824768066406
2019	78.6463928222656
2020	71.1253280639648