Year	% gross
1970	5.48456001281738
1971	4.65334987640381
1972	4.71934986114502
1973	4.7338399887085
1974	4.75197982788086
1975	5.55990982055664
1976	5.74890995025635
1977	5.85565996170044
1978	5.16213989257812
1979	5.16107988357544
1980	5.11921977996826
1981	5.21828985214233
1982	5.31017017364502
1983	5.24514007568359
1984	5.33159017562866
1985	5.43575000762939
1986	5.49456977844238
1987	5.55424976348877
1988	5.75874996185303
1989	5.95937013626099
1990	6.38527011871338
1991	6.73372983932495
1992	6.97661018371582
1993	7.24729013442993
1994	7.49893999099731
1995	7.69304990768433
1996	8.39640045166016
1997	8.58930015563965
1998	8.96774959564209
1999	8.95804977416992
2000	9.89266014099121
2001	10.693920135498
2002	11.0419702529907
2003	11.8232803344727
2004	12.4341201782227
2005	12.5545196533203
2006	12.7849102020264
2007	13.6963996887207
2008	14.9693899154663
2009	16.4086208343506
2010	17.059850692749
2011	17.8346691131592
2012	18.6777801513672
2013	19.0729598999023
2014	19.427339553833
2015	19.6324996948242
2016	19.5843296051025
2017	20.0317993164062
2018	20.1826000213623
2019	20.7816905975342
2020	21.1180591583252
2021	21.5059604644775