Year	% gross
1970	7.10710000991821
1971	7.18754005432129
1972	7.3617000579834
1973	7.50783014297485
1974	7.89662981033325
1975	8.26163005828857
1976	8.68686962127686
1977	9.17455005645752
1978	9.46776008605957
1979	9.90034961700439
1980	10.362979888916
1981	10.894700050354
1982	10.9877395629883
1983	11.7088203430176
1984	11.9792900085449
1985	12.4046697616577
1986	13.1212997436523
1987	13.4522695541382
1988	13.9596004486084
1989	13.6661796569824
1990	13.2367000579834
1991	13.3160104751587
1992	12.9964504241943
1993	12.8782596588135
1994	13.4841899871826
1995	13.5541000366211
1996	13.3909902572632
1997	9.73184967041016
1998	12.6725301742554
1999	14.6998195648193
2000	16.8578605651855
2001	18.5003795623779
2002	19.3128299713135
2003	20.8865795135498
2004	23.5234909057617
2005	26.53005027771
2006	30.4491004943848
2007	33.4790916442871
2008	36.4782981872559
2009	38.4855804443359
2010	41.6670989990234
2011	45.2207908630371
2012	47.2402114868164
2013	50.0207290649414
2014	51.7056083679199
2015	54.1528396606445
2016	56.6718482971191
2017	60.2580718994141
2018	61.0667190551758
2019	63.0017509460449
2020	62.0344886779785