Year	% gross
1970	12.5247297286987
1971	12.6610803604126
1972	13.0033397674561
1973	13.2192001342773
1974	13.193510055542
1975	13.2481498718262
1976	13.3342199325562
1977	13.4037199020386
1978	13.7148704528809
1979	14.1848497390747
1980	15.2048597335815
1981	14.862250328064
1982	15.86203956604
1983	16.682689666748
1984	17.2192192077637
1985	17.1660194396973
1986	17.5561199188232
1987	18.2053298950195
1988	18.5544204711914
1989	18.6254291534424
1990	18.4616794586182
1991	19.3243408203125
1992	20.0372505187988
1993	20.636510848999
1994	21.3517799377441
1995	22.7915306091309
1996	23.5839805603027
1997	24.4293098449707
1998	25.7939891815186
1999	26.7947902679443
2000	27.9061298370361
2001	28.9016799926758
2002	30.025520324707
2003	31.0362796783447
2004	30.9613990783691
2005	31.9016304016113
2006	33.012279510498
2007	34.0452308654785
2008	35.5038604736328
2009	37.0483589172363
2010	38.8823699951172
2011	40.2744407653809
2012	41.6062393188477
2013	42.3779716491699
2014	43.0565986633301
2015	44.0134887695312
2016	45.2549591064453
2017	45.7728881835938
2018	46.789478302002
2019	46.7778701782227
2020	47.3807907104492
2021	47.3191604614258