Year	% gross
1970	7.67280006408691
1971	7.73576021194458
1972	7.75090980529785
1973	7.7256498336792
1974	7.85659980773926
1975	7.99375009536743
1976	8.14297008514404
1977	8.27869033813477
1978	8.56149005889893
1979	8.75271034240723
1980	9.02297019958496
1981	8.92809963226318
1982	8.92728996276855
1983	8.97138977050781
1984	9.06375980377197
1985	9.15592956542969
1986	9.2709903717041
1987	9.62467956542969
1988	9.74096012115479
1989	9.70695018768311
1990	9.83055019378662
1991	9.90851974487305
1992	9.88533973693848
1993	9.96973037719727
1994	9.87252998352051
1995	9.92685031890869
1996	10.0722398757935
1997	10.0804901123047
1998	10.2997303009033
1999	10.5768203735352
2000	11.3232803344727
2001	11.3794202804565
2002	11.7386903762817
2003	12.2054300308228
2004	12.6296701431274
2005	12.9520397186279
2006	13.9533395767212
2007	14.6706600189209
2008	15.8288297653198
2009	17.0441093444824
2010	16.9573097229004
2011	17.5425395965576
2012	19.7891807556152
2013	20.8294105529785
2014	21.680269241333
2015	22.9727592468262
2016	24.3122596740723
2017	24.9148101806641
2018	24.9354496002197
2019	25.3377494812012
2020	26.219669342041