Year	% gross
1971	13.1111001968384
1972	15.2164497375488
1973	16.5160007476807
1974	17.8677406311035
1975	19.6190490722656
1976	20.234260559082
1977	21.1522102355957
1978	22.036979675293
1979	22.8772792816162
1980	23.1837692260742
1981	23.1540107727051
1983	22.3524494171143
1984	22.519889831543
1985	23.6249198913574
1986	23.7866992950439
1987	23.3360805511475
1988	25.1642208099365
1989	27.1815204620361
1990	29.1635799407959
1991	31.1145992279053
1992	34.2073593139648
1993	37.1899604797363
1994	42.1069107055664
1995	44.1447792053223
1996	45.5016098022461
1997	51.2644882202148
1998	55.0147705078125
1999	54.5314483642578
2000	56.7424812316895
2001	60.9029808044434
2002	64.526481628418
2003	68.7628707885742
2004	72.6962966918945
2005	75.500862121582
2006	78.2347793579102
2007	80.4904479980469
2008	79.2840118408203
2009	78.974006652832
2010	77.124870300293
2011	75.8586196899414
2012	73.4731826782227
2013	71.290641784668
2014	71.0140075683594
2015	70.6458129882812
2016	70.9036407470703
2017	72.500129699707
2018	75.0689468383789
2019	76.7721099853516
2020	80.6034317016602
2021	83.6086120605469