Year	% gross
1971	12.5209703445435
1972	13.3163795471191
1978	14.4631099700928
1979	13.6198196411133
1980	13.8447999954224
1981	14.595009803772
1982	15.1560802459717
1983	15.6741695404053
1984	15.7090902328491
1985	16.1465301513672
1986	17.4484100341797
1988	17.9983100891113
1989	19.2944507598877
1990	19.6127395629883
1992	19.7651100158691
1996	18.0676803588867
1997	17.8587703704834
1998	17.590259552002
1999	18.3175392150879
2000	18.9661502838135
2001	19.27174949646
2002	20.7999095916748
2004	23.5870895385742
2005	25.7587509155273
2006	27.7226696014404
2008	34.2304611206055
2010	39.3844909667969
2011	44.1024398803711
2012	47.4337997436523
2013	49.4665298461914
2014	50.7488784790039
2019	43.0752983093262
2020	42.8735618591309
2021	42.5815696716309
2022	42.2518501281738