Year	% gross
1971	46.2476501464844
1972	48.0335083007813
1973	49.413158416748
1974	50.8819694519043
1975	52.9785385131836
1976	54.001579284668
1977	56.3890609741211
1978	61.5842514038086
1979	67.2400588989258
1980	70.85791015625
1981	72.7224578857422
1982	70.5393676757813
1983	67.1672515869141
1984	64.621337890625
1985	64.3040924072266
1986	64.266960144043
1987	66.5407409667969
1988	72.9096298217773
1989	81.2122802734375
1990	84.8100967407227
1991	87.508918762207
1992	86.6002731323242
1993	82.7867279052734
1994	79.5395584106445
1995	79.4873199462891
1996	80.4642715454102
1997	80.227912902832
1998	79.3893127441406
1999	79.4965972900391
2000	79.5591278076172
2001	78.9011535644531
2002	79.9718170166016
2003	81.6531600952148
2004	84.8343200683594
2005	86.5487899780273
2006	88.2441864013672
2007	88.0413208007813
2008	85.673713684082
2009	84.5641937255859
2010	85.1620635986328
2011	87.5357513427734
2012	88.2380294799805
2013	87.9689331054688
2014	85.5503082275391
2015	81.1651382446289
2016	81.6177825927734
2017	82.2841567993164
2018	85.7837295532227
2019	89.2987365722656
2020	90.8407669067383