Year	% gross
1970	14.1464195251465
1971	13.9857301712036
1972	14.4033403396606
1973	14.7447996139526
1974	15.0916700363159
1975	16.399730682373
1976	17.0337390899658
1977	17.5619297027588
1978	18.3569793701172
1979	18.2203807830811
1980	18.4653091430664
1981	16.8259601593018
1982	16.9748497009277
1983	17.1913108825684
1984	17.3010406494141
1985	17.3031997680664
1986	17.2094402313232
1987	17.3121490478516
1988	17.292459487915
1989	17.2892894744873
1990	17.2206192016602
1991	17.088680267334
1992	16.8541507720947
1993	16.234489440918
1994	15.7085399627686
1995	15.4401502609253
1996	15.4209098815918
1997	14.5712404251099
1998	14.67516040802
1999	12.4322500228882
2000	12.6251802444458
2001	12.5157203674316
2002	13.0090703964233
2003	13.9715700149536
2004	15.0683403015137
2005	15.3180198669434
2006	15.9244899749756
2007	16.500129699707
2008	16.358039855957
2009	17.4600105285645
2010	17.4172191619873
2011	19.7747192382813
2012	24.5331401824951
2013	26.82546043396
2014	19.3247394561768
2015	20.8594493865967
2016	20.8980197906494
2017	21.3004093170166
2018	21.4186706542969
2019	21.5862598419189
2020	21.6508102416992