Year	% gross
1970	8.47552967071533
1971	8.87699031829834
1972	9.21712970733643
1973	9.57546997070313
1974	10.0267000198364
1975	10.8030195236206
1976	12.1102104187012
1977	13.218469619751
1978	14.164119720459
1979	15.7928895950317
1980	16.9261207580566
1981	19.1185398101807
1982	22.0753803253174
1983	24.3972396850586
1984	27.1758193969727
1985	29.0254993438721
1986	31.4785099029541
1987	38.9942092895508
1988	39.5349311828613
1989	39.982250213623
1990	43.5943717956543
1991	41.9034690856934
1992	44.0288200378418
1993	45.7640609741211
1994	46.598331451416
1995	48.5549201965332
1996	50.222339630127
1997	51.2497406005859
1998	52.6868591308594
1999	54.0808982849121
2000	55.4658584594727
2001	56.2391204833984
2002	56.6150398254395
2003	57.5512504577637
2004	58.6263389587402
2005	60.8570098876953
2006	63.0533409118652
2007	64.8282089233398
2008	66.6694030761719
2009	67.5578231811523
2010	73.7391662597656
2011	76.2644271850586
2012	76.5085601806641
2013	70.875732421875
2014	73.0869903564453
2015	73.6647033691406
2016	75.6096420288086
2017	76.6344528198242
2018	76.9933624267578
2019	77.5173110961914
2020	76.3220291137695