Year	% gross
1971	2.43533992767334
1972	2.49464988708496
1973	2.32522988319397
1974	2.5025999546051
1975	2.69173002243042
1976	3.72588992118835
1977	4.02079010009766
1978	4.47087001800537
1979	4.65045976638794
1980	4.6884298324585
1981	4.80444002151489
1982	4.81374979019165
1983	4.85995006561279
1984	4.91050004959106
1985	5.1911301612854
1986	5.41474008560181
1987	5.19685983657837
1988	5.47121000289917
1989	6.69699001312256
1990	7.6159200668335
1991	8.242600440979
1992	9.02952003479004
1993	10.2180500030518
1994	10.9020595550537
1995	11.2841596603394
1996	11.9884395599365
1997	12.5954103469849
1998	13.8757600784302
1999	15.4802303314209
2000	17.8167400360107
2001	20.3472995758057
2002	22.0303802490234
2003	26.1172008514404
2004	28.5109004974365
2005	30.2890605926514
2006	31.0529403686523
2007	31.341890335083
2008	32.5300407409668
2009	34.0606307983398
2010	34.6434898376465
2011	34.4940605163574
2012	34.2753295898438
2013	33.0226402282715
2014	33.0825691223145
2015	33.0580787658691
2016	31.186559677124
2017	31.0175304412842
2018	31.1403503417969
2019	31.8208293914795
2020	33.1319389343262
2021	33.8982810974121
2022	37.8049087524414