Year	% gross
1970	8.55107021331787
1971	8.93161964416504
1972	9.37967967987061
1973	9.80177974700928
1974	10.372989654541
1975	11.43284034729
1976	12.943380355835
1977	14.2642002105713
1978	15.3426198959351
1979	16.8623104095459
1980	18.0205993652344
1981	20.3186893463135
1982	23.1664695739746
1983	25.3834991455078
1984	27.9562206268311
1985	29.767749786377
1986	32.1335716247559
1987	38.9925117492676
1988	39.4661903381348
1989	39.8899803161621
1990	43.4128112792969
1991	41.8385810852051
1992	44.006908416748
1993	45.7082214355469
1994	46.5268287658691
1995	48.3722190856934
1996	49.8725318908691
1997	50.8648109436035
1998	52.3790817260742
1999	53.8402099609375
2000	55.2046012878418
2001	56.0852203369141
2002	56.5780410766602
2003	57.6911087036133
2004	58.8848609924316
2005	61.2096099853516
2006	63.5123100280762
2007	65.145637512207
2008	67.4192276000977
2009	68.4520111083984
2010	74.131950378418
2011	76.3381118774414
2012	76.7912521362305
2013	70.6906814575195
2014	72.4788436889648
2015	73.238639831543
2016	74.5388488769531
2017	75.6618576049805
2018	76.0927581787109
2019	76.4368209838867
2020	75.5764083862305