Year	% gross
1970	47.8845291137695
1971	47.5771217346191
1972	47.9925994873047
1973	48.808780670166
1974	49.8901481628418
1975	51.7149696350098
1976	52.3437004089355
1977	53.1612510681152
1978	54.2211112976074
1979	54.4096488952637
1980	55.0508918762207
1981	52.4214210510254
1982	53.0157814025879
1983	53.2775497436523
1984	53.5708503723145
1985	54.5563087463379
1986	55.149528503418
1987	56.241870880127
1988	56.9668312072754
1989	57.3517303466797
1990	57.7336616516113
1991	56.3449516296387
1992	54.4668998718262
1993	51.5727310180664
1994	46.6556091308594
1995	45.9293785095215
1996	45.1246299743652
1997	43.6088485717773
1998	41.9124183654785
1999	38.878849029541
2000	38.6367416381836
2001	39.3157615661621
2002	40.3449211120605
2003	42.6990585327148
2004	43.5456008911133
2005	44.7976608276367
2006	46.647029876709
2007	48.5079307556152
2008	50.713020324707
2009	52.0837593078613
2010	53.7705116271973
2011	55.3049812316895
2012	56.7266006469727
2013	56.3955383300781
2014	57.482250213623
2015	58.2987403869629
2016	59.2797012329102
2017	60.1523704528809
2018	61.6413688659668
2019	62.8262481689453
2020	64.8149871826172