Year	% gross
1971	7.17838001251221
1972	7.94093990325928
1973	8.99497032165527
1974	9.98834037780762
1975	11.2386198043823
1976	12.8549900054932
1977	14.7923698425293
1978	15.4838399887085
1979	15.6114597320557
1980	16.0165100097656
1981	16.9067993164062
1982	17.874439239502
1983	18.45751953125
1984	18.9920501708984
1985	17.7589702606201
1986	17.6779403686523
1987	17.7877292633057
1988	17.3606491088867
1989	14.7903299331665
1990	13.6414098739624
1991	11.4388704299927
1999	28.8631801605225
2001	28.1952991485596
2002	29.316650390625
2003	26.3915996551514
2004	27.6763496398926
2005	28.7957496643066
2006	28.7297592163086
2007	29.175989151001
2008	28.9939308166504
2009	29.6097393035889
2010	30.5086708068848
2011	25.8721904754639
2012	26.4579601287842
2013	28.5217609405518
2014	29.1688709259033
2015	32.8131103515625
2016	31.9304790496826
2017	33.1621017456055
2018	36.7171516418457
2020	40.012939453125
2022	37.8184509277344