Year	% gross
1971	8.99878978729248
1972	8.64278030395508
1973	12.0987901687622
1974	13.325719833374
1975	6.79369020462036
1976	9.03804016113281
1977	11.816370010376
1978	12.8592596054077
1979	15.015830039978
1980	19.5033206939697
1981	22.8797302246094
1982	24.5169105529785
1983	26.0365390777588
1984	29.5316390991211
1985	32.3776702880859
1986	34.3219413757324
1987	34.0821990966797
1988	36.997989654541
1989	37.7880706787109
1990	40.0030288696289
1991	42.1523208618164
1992	44.8064002990723
1993	58.4620590209961
1994	58.7244415283203
1995	58.5476417541504
1996	60.1579895019531
1997	60.1737403869629
1999	60.4168014526367
2000	57.2409591674805
2001	59.6066398620605
2002	59.2648086547852
2003	59.7761192321777
2004	60.925910949707
2005	63.8962097167969
2006	77.9680709838867
2007	79.1873092651367
2008	81.9205703735352
2009	80.1720581054688
2010	79.0686874389648
2011	79.1252517700195
2012	77.2644271850586
2013	78.3891067504883
2014	77.3328704833984
2015	79.7202835083008
2016	80.4460372924805
2017	83.2118911743164
2018	84.0174789428711
2019	85.7730407714844
2020	85.5230407714844