Year	% gross
1970	8.30799961090088
1971	8.27171039581299
1972	8.39295959472656
1973	8.59788990020752
1974	8.62607002258301
1975	8.76562023162842
1976	8.88074016571045
1977	8.7685604095459
1978	9.00949954986572
1979	9.43865013122559
1980	10.4147701263428
1981	10.0434999465942
1982	10.9967603683472
1983	11.8119802474976
1984	12.4013900756836
1985	12.2464199066162
1986	12.5749797821045
1987	12.753809928894
1988	13.089750289917
1989	13.3455600738525
1990	13.1265497207642
1991	14.1269502639771
1992	14.9832000732422
1993	15.7732696533203
1994	16.7340793609619
1995	18.4467697143555
1996	19.4766502380371
1997	20.4182395935059
1998	21.7644500732422
1999	22.8925800323486
2000	24.144079208374
2001	25.2656593322754
2002	26.4590301513672
2003	26.889139175415
2004	26.6791400909424
2005	27.5948104858398
2006	28.7431697845459
2007	29.7576904296875
2008	31.2881298065186
2009	32.9507904052734
2010	34.912181854248
2011	36.269458770752
2012	37.8079109191895
2013	39.3565406799316
2014	40.4890098571777
2015	41.5416107177734
2016	42.9896812438965
2017	43.5177307128906
2018	44.3865089416504
2019	44.2671089172363
2020	44.8671417236328
2021	44.6467208862305