Year	% gross
1970	33.8785095214844
1971	34.141960144043
1972	36.7100296020508
1973	38.336498260498
1974	39.945068359375
1975	42.7836608886719
1976	45.2932395935059
1977	47.6676788330078
1978	49.652458190918
1979	50.8391494750977
1980	51.7360191345215
1981	52.119930267334
1982	53.1074905395508
1983	53.5746917724609
1984	54.3392486572266
1985	55.312198638916
1986	57.7045097351074
1987	58.9903411865234
1988	59.4864883422852
1989	60.6055908203125
1990	63.6061515808105
1991	63.3528099060059
1992	62.3065795898438
1993	63.5957717895508
1994	66.3612976074219
1995	65.7741775512695
1996	65.5186386108398
1997	66.4865493774414
1998	67.7333831787109
1999	68.9191131591797
2000	69.8772125244141
2001	70.921501159668
2002	71.5612335205078
2003	72.2377090454102
2004	72.7907180786133
2005	71.9047393798828
2006	71.6172866821289
2007	69.5238418579102
2008	70.6762237548828
2009	72.3204727172852
2010	73.1093826293945
2011	76.5821762084961
2012	77.5809707641602
2013	75.0252380371094
2014	75.2062530517578
2015	75.0729293823242
2016	75.1104888916016
2017	75.1483306884766
2018	75.2544479370117
2019	75.6238708496094
2020	76.2814712524414
2021	77.2184982299805
2022	77.6200714111328