Year	% gross
1971	18.7146396636963
1976	20.050609588623
1981	24.0613307952881
1982	23.5095691680908
1983	23.1084403991699
1984	22.6133708953857
1985	22.2691402435303
1986	22.3312797546387
1987	21.7130298614502
1988	21.5484199523926
1989	20.746129989624
1990	19.4081497192383
1991	18.010950088501
1992	19.1473197937012
1993	18.8920192718506
1994	19.6395301818848
1995	20.7036800384521
1996	20.85498046875
1997	21.2325000762939
1998	21.6118507385254
1999	23.0991706848145
2000	23.3065490722656
2001	24.5885200500488
2002	26.6909408569336
2003	26.9667701721191
2004	27.4246597290039
2005	29.0530300140381
2006	28.5933895111084
2007	34.5610008239746
2008	39.1393508911133
2009	39.420539855957
2010	37.7205505371094
2012	39.6751708984375
2013	38.5747909545898
2014	38.7814712524414
2015	41.060920715332
2017	40.9570503234863
2018	40.9259605407715
2019	39.7398986816406
2020	40.4296417236328
2021	40.5491714477539
2022	41.6616516113281