Year	% gross
1971	4.65799999237061
1972	5.49539995193481
1973	8.8156099319458
1974	10.1403102874756
1975	11.5628204345703
1976	14.4285001754761
1977	16.0565700531006
1978	18.5767593383789
1979	17.435359954834
1980	19.1147308349609
1981	20.0890808105469
1982	21.1452503204346
1983	22.333179473877
1984	24.6479606628418
1985	25.816219329834
1986	28.5809898376465
1987	30.1593494415283
1988	32.677619934082
1989	34.603401184082
1990	37.1374702453613
1991	39.1006011962891
1992	41.3725891113281
1993	43.4140892028809
1994	45.3797416687012
1995	48.1316986083984
1996	50.4382705688477
1997	53.6185493469238
1998	56.6590385437012
1999	59.4760704040527
2000	63.3611183166504
2001	65.5563735961914
2002	69.3970031738281
2003	71.3997116088867
2004	74.4489669799805
2005	75.080207824707
2006	76.1726303100586
2007	76.6395721435547
2008	76.9493179321289
2009	79.269660949707
2010	84.4513473510742
2011	89.1767425537109
2012	91.1131286621094
2013	93.5904388427734
2014	96.3178482055664
2015	96.5417327880859
2016	98.1558685302734
2017	100.66185760498
2018	101.434112548828
2019	100.552711486816
2020	101.530853271484
2021	106.152816772461