Year	% gross
1970	3.40041995048523
1971	3.4376699924469
1972	3.7318799495697
1973	4.11269998550415
1974	4.42645978927612
1975	4.85213994979858
1976	5.43185997009277
1977	5.83308982849121
1978	6.19754981994629
1979	6.51667022705078
1980	6.95031976699829
1981	7.50263023376465
1982	7.85731983184814
1983	8.13545989990234
1984	8.45584011077881
1985	8.66679954528809
1986	8.88004970550537
1987	9.01945018768311
1988	9.5523099899292
1989	9.59185028076172
1990	9.94318962097168
1991	10.0425796508789
1992	10.7116203308105
1993	11.659649848938
1994	12.2323999404907
1995	13.0774202346802
1996	14.2200202941895
1997	15.2658004760742
1998	16.3491191864014
1999	17.8397598266602
2000	18.4357891082764
2001	19.3491897583008
2002	20.1395301818848
2003	21.0756607055664
2004	22.3334293365479
2005	23.6661796569824
2006	24.944299697876
2007	26.3760890960693
2008	29.2887306213379
2009	29.5948104858398
2010	31.241870880127
2011	32.0437316894531
2012	34.1855583190918
2013	35.3806915283203
2014	37.9222412109375
2015	40.2323112487793
2016	40.7547302246094
2017	41.2599105834961
2018	42.2356109619141
2019	42.6380081176758
2020	42.611888885498
2021	42.549919128418
2022	42.746509552002