Year	% gross
1970	7.90345001220703
1971	7.83795976638794
1972	7.7214298248291
1973	7.69097995758057
1974	7.60192012786865
1975	7.79732990264893
1976	8.25051021575928
1977	8.61993026733398
1978	8.42273998260498
1979	8.6315803527832
1980	8.81035041809082
1981	9.13556957244873
1982	9.45890045166016
1983	9.63582038879395
1984	9.94130992889404
1985	10.1729097366333
1986	10.3182401657104
1987	10.4616203308105
1988	10.2676601409912
1989	10.5998802185059
1990	10.6705799102783
1991	10.7841300964355
1992	10.7462902069092
1993	11.0166397094727
1994	11.2185001373291
1995	11.412449836731
1996	11.7473802566528
1997	11.9833698272705
1998	12.3512096405029
1999	12.3369903564453
2000	12.8894500732422
2001	13.0239601135254
2002	13.2889204025269
2003	13.9986801147461
2004	14.5084295272827
2005	15.2436199188232
2006	17.1726093292236
2007	17.3398399353027
2008	18.9845294952393
2009	21.6961097717285
2010	22.3055191040039
2011	22.8874092102051
2012	23.4304790496826
2013	24.6618194580078
2014	26.3313293457031
2015	26.3471908569336
2016	26.7113800048828
2017	26.8931503295898
2018	26.9975605010986
2019	27.6451892852783
2020	28.1591892242432