Year	% gross
1970	6.63327980041504
1971	6.61604976654053
1972	6.67067003250122
1973	6.79631996154785
1974	7.00662994384766
1975	7.30966997146606
1976	7.65094995498657
1977	7.78136014938354
1978	8.01636981964111
1979	8.44425964355469
1980	8.8477897644043
1981	9.16769027709961
1982	9.06581974029541
1983	9.06219005584717
1984	9.08121967315674
1985	9.03660011291504
1986	9.3173303604126
1987	9.53563022613525
1988	9.3546199798584
1989	9.43400955200195
1990	9.48443031311035
1991	9.54067039489746
1992	9.59158039093018
1993	9.74026966094971
1994	10.3474102020264
1995	10.9620704650879
1996	11.904990196228
1997	12.8514604568481
1998	13.834659576416
1999	14.9366998672485
2000	15.9253702163696
2001	16.968879699707
2002	18.4291591644287
2003	19.8880596160889
2004	21.0529594421387
2005	22.046459197998
2006	23.4664497375488
2007	24.7257194519043
2008	26.1725997924805
2009	27.2452793121338
2010	28.9860496520996
2011	31.3361701965332
2012	33.1215705871582
2013	34.3925895690918
2014	38.3174896240234
2015	40.1269493103027
2016	41.1388816833496
2017	41.9093894958496
2018	42.6721687316895
2019	43.8161811828613
2020	45.5863304138184
2021	47.8276710510254
2022	49.3631782531738