Year	% gross
1971	3.35734009742737
1972	3.63759994506836
1973	4.46728992462158
1974	5.28704977035522
1975	5.73787021636963
1976	6.9994797706604
1977	9.25566005706787
1978	9.26648998260498
1979	10.4550695419312
1980	14.6527099609375
1981	16.848840713501
1982	19.6756706237793
1983	20.2918796539307
1984	21.865930557251
1985	19.7681903839111
1986	18.7005290985107
1987	20.0215606689453
1988	17.7654705047607
1989	19.856029510498
1990	19.8721599578857
1991	21.5721206665039
1992	21.2020492553711
1993	20.945140838623
1994	19.2753791809082
1995	18.8796501159668
1996	20.8903007507324
1997	23.6230392456055
2000	29.3279304504395
2002	32.5957489013672
2003	36.4936904907227
2004	40.8914489746094
2005	40.2474098205566
2006	39.425910949707
2007	37.1591186523438
2008	39.9050712585449
2009	40.870548248291
2010	37.1989288330078
2011	36.9979705810547
2012	43.5532913208008
2015	33.2689094543457
2016	31.6559906005859
2017	28.4306602478027
2018	32.306568145752
2019	31.5987300872803
2020	32.668529510498
2021	33.4914512634277
2022	36.0088081359863