Year	% gross
1970	18.0059795379639
1971	18.0655994415283
1972	18.3410701751709
1973	18.7185802459717
1974	18.6077003479004
1975	18.9219799041748
1976	18.9151992797852
1977	19.7974300384521
1978	20.5550708770752
1979	21.530740737915
1980	22.5104694366455
1981	22.1994094848633
1982	22.8037796020508
1983	23.4507293701172
1984	23.3789196014404
1985	23.1314792633057
1986	22.6155490875244
1987	22.8268203735352
1988	22.8764190673828
1989	22.828800201416
1990	22.3707408905029
1991	23.3542499542236
1992	24.0136394500732
1993	24.7325801849365
1994	25.7939205169678
1995	26.6874103546143
1996	27.3786201477051
1997	27.892110824585
1998	28.8323497772217
1999	29.6519107818604
2000	30.5167102813721
2001	31.7127494812012
2002	32.7184791564941
2003	33.3379898071289
2004	34.4196701049805
2005	34.8174705505371
2006	36.3227500915527
2007	37.283260345459
2008	38.3438186645508
2009	40.3793106079102
2010	41.6103096008301
2011	42.2437705993652
2012	43.6017990112305
2013	45.2206001281738
2014	46.0339393615723
2015	46.2558212280273
2016	47.7115211486816
2017	47.3193817138672
2018	48.0902404785156
2019	48.0432891845703
2020	48.3397407531738
2021	48.2449989318848